diff --git a/app/src/main/java/com/grigowashere/loratester/LoraApp.java b/app/src/main/java/com/grigowashere/loratester/LoraApp.java
index a9d4a37..a7fe8cd 100644
--- a/app/src/main/java/com/grigowashere/loratester/LoraApp.java
+++ b/app/src/main/java/com/grigowashere/loratester/LoraApp.java
@@ -6,6 +6,7 @@ import com.grigowashere.loratester.api.ServerApi;
 import com.grigowashere.loratester.location.LocationTracker;
 import com.grigowashere.loratester.net.NetworkMonitor;
 import com.grigowashere.loratester.track.TrackRecorder;
+import com.grigowashere.loratester.ui.LinkLossAlerter;
 
 import org.mapsforge.map.android.graphics.AndroidGraphicFactory;
 
@@ -18,15 +19,18 @@ public class LoraApp extends Application {
     private PeerStatsCache peerStatsCache;
     private CommandPoller commandPoller;
     private LocationTracker locationTracker;
+    private LinkLossAlerter linkLossAlerter;
 
     @Override
     public void onCreate() {
         super.onCreate();
         AndroidGraphicFactory.createInstance(this);
         settingsRepository = new SettingsRepository(this);
+        linkLossAlerter = new LinkLossAlerter(this, settingsRepository);
         networkMonitor = new NetworkMonitor(this);
         networkMonitor.start();
         telemetryUploader = new TelemetryUploader(this, settingsRepository, networkMonitor);
+        telemetryUploader.setLinkLossAlerter(linkLossAlerter);
         peerStatsCache = new PeerStatsCache();
         ServerApi serverApi = new ServerApi(settingsRepository.getServerUrl());
         String deviceId = settingsRepository.getOrCreateDeviceId();
@@ -79,6 +83,10 @@ public class LoraApp extends Application {
         return commandPoller;
     }
 
+    public LinkLossAlerter getLinkLossAlerter() {
+        return linkLossAlerter;
+    }
+
     public synchronized void startLocationUpdates() {
         if (locationTracker == null) {
             locationTracker = new LocationTracker(this, (lat, lon, alt) -> {
diff --git a/app/src/main/java/com/grigowashere/loratester/SettingsRepository.java b/app/src/main/java/com/grigowashere/loratester/SettingsRepository.java
index 232ee28..26070ad 100644
--- a/app/src/main/java/com/grigowashere/loratester/SettingsRepository.java
+++ b/app/src/main/java/com/grigowashere/loratester/SettingsRepository.java
@@ -14,6 +14,7 @@ public class SettingsRepository {
     private static final String KEY_TELNET_ENABLED = "telnet_enabled";
     private static final String KEY_DEVICE_ID = "device_id";
     private static final String KEY_DEVICE_LABEL = "device_label";
+    private static final String KEY_LINK_LOSS_ALERT = "link_loss_alert_enabled";
 
     public static final String DEFAULT_SERVER = "https://lora.grigowashere.ru";
     private static final String LEGACY_SERVER_HTTP = "http://grigowashere.ru:7634";
@@ -119,4 +120,12 @@ public class SettingsRepository {
             prefs.edit().putString(KEY_DEVICE_LABEL, label.trim()).apply();
         }
     }
+
+    public boolean isLinkLossAlertEnabled() {
+        return prefs.getBoolean(KEY_LINK_LOSS_ALERT, false);
+    }
+
+    public void setLinkLossAlertEnabled(boolean enabled) {
+        prefs.edit().putBoolean(KEY_LINK_LOSS_ALERT, enabled).apply();
+    }
 }
diff --git a/app/src/main/java/com/grigowashere/loratester/TelemetryUploader.java b/app/src/main/java/com/grigowashere/loratester/TelemetryUploader.java
index 34092cb..07ae8f7 100644
--- a/app/src/main/java/com/grigowashere/loratester/TelemetryUploader.java
+++ b/app/src/main/java/com/grigowashere/loratester/TelemetryUploader.java
@@ -11,11 +11,13 @@ import com.grigowashere.loratester.api.TelemetryPayload;
 import com.grigowashere.loratester.api.UploadQueue;
 import com.grigowashere.loratester.net.NetworkMonitor;
 import com.grigowashere.loratester.location.GeoUtils;
+import com.grigowashere.loratester.model.RadioSnapshot;
 import com.grigowashere.loratester.telnet.AtCommandFormatter;
 import com.grigowashere.loratester.telnet.RadioMacroBuilder;
 import com.grigowashere.loratester.telnet.StatsExtractor;
 import com.grigowashere.loratester.telnet.TelnetClient;
 import com.grigowashere.loratester.telnet.TelnetFrameParser;
+import com.grigowashere.loratester.ui.LinkLossAlerter;
 
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
@@ -69,6 +71,7 @@ public class TelemetryUploader implements TelnetClient.Listener {
     private volatile StatsExtractor.ExtractedStats lastStats;
     private volatile long lastStatsAtMs;
     private StatsListener statsListener;
+    private LinkLossAlerter linkLossAlerter;
     private final UploadQueue uploadQueue;
     private final NetworkMonitor networkMonitor;
 
@@ -265,6 +268,10 @@ public class TelemetryUploader implements TelnetClient.Listener {
         }
     }
 
+    public void setLinkLossAlerter(LinkLossAlerter alerter) {
+        this.linkLossAlerter = alerter;
+    }
+
     public StatsExtractor.ExtractedStats getLastStats() {
         return lastStats;
     }
@@ -284,6 +291,14 @@ public class TelemetryUploader implements TelnetClient.Listener {
         if (listener != null) {
             mainHandler.post(() -> listener.onStatsUpdated(stats));
         }
+        LinkLossAlerter alerter = linkLossAlerter;
+        if (alerter != null) {
+            RadioSnapshot snap = RadioSnapshot.fromExtracted(stats);
+            if (StatsExtractor.ROLE_RX.equals(snap.role) && snap.rxQualityPercent != null) {
+                Double quality = snap.rxQualityPercent;
+                mainHandler.post(() -> alerter.onQualitySample(quality));
+            }
+        }
         TelemetryPayload payload = new TelemetryPayload(
                 settings.getOrCreateDeviceId(),
                 phoneLabel(),
diff --git a/app/src/main/java/com/grigowashere/loratester/ui/LinkLossAlerter.java b/app/src/main/java/com/grigowashere/loratester/ui/LinkLossAlerter.java
new file mode 100644
index 0000000..8a7d0f7
--- /dev/null
+++ b/app/src/main/java/com/grigowashere/loratester/ui/LinkLossAlerter.java
@@ -0,0 +1,92 @@
+package com.grigowashere.loratester.ui;
+
+import android.content.Context;
+import android.media.AudioManager;
+import android.media.ToneGenerator;
+import android.os.Build;
+import android.os.VibrationEffect;
+import android.os.Vibrator;
+import android.os.VibratorManager;
+
+import com.grigowashere.loratester.SettingsRepository;
+
+/** One-shot audio + vibration when RX quality drops to 0. */
+public final class LinkLossAlerter {
+
+    private static final int VIBRATE_MS = 300;
+    private static final int TONE_MS = 400;
+
+    private final SettingsRepository settings;
+    private final Context appContext;
+    private Double lastQuality;
+
+    public LinkLossAlerter(Context context, SettingsRepository settings) {
+        this.appContext = context.getApplicationContext();
+        this.settings = settings;
+    }
+
+    public synchronized void onQualitySample(Double quality) {
+        if (!settings.isLinkLossAlertEnabled()) {
+            lastQuality = quality;
+            return;
+        }
+        if (quality != null && quality > 0) {
+            lastQuality = quality;
+            return;
+        }
+        if (quality != null && quality == 0
+                && (lastQuality == null || lastQuality > 0)) {
+            fireAlert();
+        }
+        lastQuality = quality;
+    }
+
+    private void fireAlert() {
+        vibrate();
+        playTone();
+    }
+
+    private void vibrate() {
+        try {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+                VibratorManager vm = (VibratorManager) appContext.getSystemService(
+                        Context.VIBRATOR_MANAGER_SERVICE);
+                if (vm != null) {
+                    Vibrator v = vm.getDefaultVibrator();
+                    if (v != null && v.hasVibrator()) {
+                        v.vibrate(VibrationEffect.createOneShot(
+                                VIBRATE_MS,
+                                VibrationEffect.DEFAULT_AMPLITUDE
+                        ));
+                    }
+                }
+            } else {
+                Vibrator v = (Vibrator) appContext.getSystemService(Context.VIBRATOR_SERVICE);
+                if (v != null && v.hasVibrator()) {
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                        v.vibrate(VibrationEffect.createOneShot(
+                                VIBRATE_MS,
+                                VibrationEffect.DEFAULT_AMPLITUDE
+                        ));
+                    } else {
+                        v.vibrate(VIBRATE_MS);
+                    }
+                }
+            }
+        } catch (Exception ignored) {
+            // ignore missing vibrator
+        }
+    }
+
+    private void playTone() {
+        try {
+            ToneGenerator tone = new ToneGenerator(
+                    AudioManager.STREAM_NOTIFICATION,
+                    ToneGenerator.MAX_VOLUME / 2
+            );
+            tone.startTone(ToneGenerator.TONE_PROP_BEEP, TONE_MS);
+        } catch (Exception ignored) {
+            // ignore missing audio
+        }
+    }
+}
diff --git a/app/src/main/java/com/grigowashere/loratester/ui/MapFragment.java b/app/src/main/java/com/grigowashere/loratester/ui/MapFragment.java
index d084d1a..8d3af9b 100644
--- a/app/src/main/java/com/grigowashere/loratester/ui/MapFragment.java
+++ b/app/src/main/java/com/grigowashere/loratester/ui/MapFragment.java
@@ -3,6 +3,8 @@ package com.grigowashere.loratester.ui;
 import android.content.Context;
 import android.graphics.PorterDuff;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
@@ -81,6 +83,7 @@ public class MapFragment extends Fragment {
 
     private static final int TILE_SIZE_PX = 256;
     private static final long DEVICE_POLL_MS = 5000;
+    private static final long SELF_POSITION_MS = 1000;
     /** Ignore GPS jitter smaller than ~11 m. */
     private static final double POSITION_EPS = 0.0001;
     private static final float USER_PAN_THRESHOLD_PX = 12f;
@@ -88,6 +91,7 @@ public class MapFragment extends Fragment {
     private static final int ARGB_TX = 0xFFE94560;
     private static final int ARGB_RX = 0xFF4FC3F7;
     private static final int ARGB_TRACK = 0xFF00FF88;
+    private static final int ARGB_SELF = 0xFF00FF88;
     private static final int ARGB_HILL = 0xFFFFC107;
     private static final int HILL_SEARCH_RADIUS_M = 5000;
     private static final long LORA_STATS_FRESH_MS = 120_000;
@@ -104,6 +108,7 @@ public class MapFragment extends Fragment {
 
     private FragmentPollHelper pollHelper;
     private TelemetryUploader uploader;
+    private LinkLossAlerter linkLossAlerter;
     private TrackRecorder trackRecorder;
     private CommandPoller commandPoller;
     private MapView mapView;
@@ -147,6 +152,8 @@ public class MapFragment extends Fragment {
     private Bitmap bitmapRx;
     private Bitmap bitmapTrackPoint;
     private Bitmap bitmapHill;
+    private Bitmap bitmapSelf;
+    private Marker selfMarker;
     private Marker hillMarker;
     private Polyline hillPathLine;
     private boolean hillActive;
@@ -164,12 +171,15 @@ public class MapFragment extends Fragment {
     private float touchDownX;
     private float touchDownY;
     private Runnable pendingFitRunnable;
+    private final Handler selfPositionHandler = new Handler(Looper.getMainLooper());
+    private Runnable selfPositionTick;
 
     @Override
     public void onAttach(@NonNull Context context) {
         super.onAttach(context);
         LoraApp app = (LoraApp) context.getApplicationContext();
         uploader = app.getTelemetryUploader();
+        linkLossAlerter = app.getLinkLossAlerter();
         trackRecorder = app.getTrackRecorder();
         commandPoller = app.getCommandPoller();
         networkMonitor = app.getNetworkMonitor();
@@ -401,10 +411,11 @@ public class MapFragment extends Fragment {
             position.setZoomLevel((byte) 12);
         }
 
-        bitmapTx = MapsforgeBitmaps.dot(ARGB_TX, 20);
-        bitmapRx = MapsforgeBitmaps.dot(ARGB_RX, 20);
-        bitmapTrackPoint = MapsforgeBitmaps.dot(ARGB_TRACK, 12);
-        bitmapHill = MapsforgeBitmaps.dot(ARGB_HILL, 22);
+        bitmapTx = MapsforgeBitmaps.dot(ARGB_TX, 26);
+        bitmapRx = MapsforgeBitmaps.dot(ARGB_RX, 26);
+        bitmapTrackPoint = MapsforgeBitmaps.dot(ARGB_TRACK, 16);
+        bitmapHill = MapsforgeBitmaps.dot(ARGB_HILL, 28);
+        bitmapSelf = MapsforgeBitmaps.dot(ARGB_SELF, 24);
 
         mapInitialized = true;
     }
@@ -419,6 +430,7 @@ public class MapFragment extends Fragment {
         if (pollHelper != null) {
             pollHelper.start(0);
         }
+        startSelfPositionTick();
         if (trackRecorder != null && btnTrack != null) {
             setupTrackRecorderListener();
         }
@@ -429,6 +441,7 @@ public class MapFragment extends Fragment {
     public void onPause() {
         mapResumed = false;
         saveCameraState();
+        stopSelfPositionTick();
         if (pollHelper != null) {
             pollHelper.stop();
         }
@@ -443,6 +456,7 @@ public class MapFragment extends Fragment {
         mapResumed = false;
         mapInitialized = false;
         cancelPendingFit();
+        stopSelfPositionTick();
         if (pollHelper != null) {
             pollHelper.stop();
         }
@@ -454,6 +468,7 @@ public class MapFragment extends Fragment {
             trackRecorder.setListener(null);
         }
         removeAllDeviceMarkers();
+        removeSelfMarker();
         clearTrackLayers();
         clearLiveTrackLayers();
         clearHillLayers();
@@ -473,6 +488,7 @@ public class MapFragment extends Fragment {
         bitmapRx = null;
         bitmapTrackPoint = null;
         bitmapHill = null;
+        bitmapSelf = null;
         iconServer = null;
         iconLora = null;
         btnFindHill = null;
@@ -899,6 +915,64 @@ public class MapFragment extends Fragment {
         }
     }
 
+    private void removeSelfMarker() {
+        if (selfMarker != null && mapView != null) {
+            mapView.getLayerManager().getLayers().remove(selfMarker);
+        }
+        selfMarker = null;
+    }
+
+    private void startSelfPositionTick() {
+        stopSelfPositionTick();
+        selfPositionTick = new Runnable() {
+            @Override
+            public void run() {
+                if (!mapResumed) {
+                    return;
+                }
+                tickSelfPosition();
+                selfPositionHandler.postDelayed(this, SELF_POSITION_MS);
+            }
+        };
+        selfPositionHandler.post(selfPositionTick);
+    }
+
+    private void stopSelfPositionTick() {
+        if (selfPositionTick != null) {
+            selfPositionHandler.removeCallbacks(selfPositionTick);
+            selfPositionTick = null;
+        }
+    }
+
+    private void tickSelfPosition() {
+        updateSelfPositionMarker();
+        updateRxQuality();
+        if (linkLossAlerter != null) {
+            linkLossAlerter.onQualitySample(resolveRxQualityPercent());
+        }
+    }
+
+    private void updateSelfPositionMarker() {
+        if (!isMapReady() || uploader == null || bitmapSelf == null) {
+            return;
+        }
+        if (!uploader.hasGpsFix()) {
+            removeSelfMarker();
+            return;
+        }
+        LatLong pos = new LatLong(uploader.getGpsLat(), uploader.getGpsLon());
+        if (selfMarker == null) {
+            selfMarker = new Marker(pos, bitmapSelf, 0, 0);
+            mapView.getLayerManager().getLayers().add(selfMarker);
+            requestMapInvalidate();
+            return;
+        }
+        if (!samePosition(selfMarker.getLatLong(), pos)) {
+            selfMarker.setLatLong(pos);
+            requestMapInvalidate();
+        }
+    }
+
     private Bitmap roleBitmap(String role) {
         return StatsExtractor.ROLE_RX.equals(role) ? bitmapRx : bitmapTx;
     }
@@ -1450,6 +1524,8 @@ public class MapFragment extends Fragment {
         int onMap = 0;
         List<LatLong> boundsPoints = new ArrayList<>();
         Set<String> seen = new HashSet<>();
+        String myId = uploader != null ? uploader.getDeviceId() : null;
+        boolean hideSelfOnServer = uploader != null && uploader.hasGpsFix();
 
         for (DeviceInfo d : devices) {
             if (StatsExtractor.ROLE_TX.equals(d.role)) {
@@ -1457,6 +1533,13 @@ public class MapFragment extends Fragment {
             } else if (StatsExtractor.ROLE_RX.equals(d.role)) {
                 rxCount++;
             }
+            if (hideSelfOnServer && myId != null && myId.equals(d.device_id)) {
+                Marker existing = deviceMarkers.remove(d.device_id);
+                if (existing != null) {
+                    mapView.getLayerManager().getLayers().remove(existing);
+                }
+                continue;
+            }
             if (!GeoUtils.isValidCoordinate(d.lat, d.lon)) {
                 continue;
             }
diff --git a/app/src/main/java/com/grigowashere/loratester/ui/SettingsFragment.java b/app/src/main/java/com/grigowashere/loratester/ui/SettingsFragment.java
index 2408681..867566a 100644
--- a/app/src/main/java/com/grigowashere/loratester/ui/SettingsFragment.java
+++ b/app/src/main/java/com/grigowashere/loratester/ui/SettingsFragment.java
@@ -46,6 +46,7 @@ public class SettingsFragment extends Fragment {
         TextInputEditText editRange = view.findViewById(R.id.editRangeRegex);
         TextInputEditText editDeviceLabel = view.findViewById(R.id.editDeviceLabel);
         SwitchMaterial switchTelnet = view.findViewById(R.id.switchTelnet);
+        SwitchMaterial switchLinkLossAlert = view.findViewById(R.id.switchLinkLossAlert);
         Button batteryBtn = view.findViewById(R.id.btnBatteryOptimization);
         TextView deviceIdLabel = view.findViewById(R.id.deviceIdLabel);
         Button save = view.findViewById(R.id.btnSaveSettings);
@@ -60,6 +61,7 @@ public class SettingsFragment extends Fragment {
             editDeviceLabel.setText(savedLabel);
         }
         switchTelnet.setChecked(settings.isTelnetEnabled());
+        switchLinkLossAlert.setChecked(settings.isLinkLossAlertEnabled());
         deviceIdLabel.setText(getString(R.string.device_id_label, settings.getOrCreateDeviceId()));
 
         batteryBtn.setOnClickListener(v -> {
@@ -82,6 +84,7 @@ public class SettingsFragment extends Fragment {
             settings.setRangeRegex(textOf(editRange, SettingsRepository.DEFAULT_RANGE_REGEX));
             settings.setDeviceLabel(textOf(editDeviceLabel, ""));
             settings.setTelnetEnabled(switchTelnet.isChecked());
+            settings.setLinkLossAlertEnabled(switchLinkLossAlert.isChecked());
             uploader.refreshApi();
             uploader.registerPresence();
             if (switchTelnet.isChecked()) {
diff --git a/app/src/main/res/layout/fragment_map.xml b/app/src/main/res/layout/fragment_map.xml
index 10848a6..082d8b8 100644
--- a/app/src/main/res/layout/fragment_map.xml
+++ b/app/src/main/res/layout/fragment_map.xml
@@ -16,7 +16,7 @@
         android:layout_gravity="top|start"
         android:layout_marginStart="8dp"
         android:layout_marginTop="8dp"
-        android:layout_marginEnd="56dp"
+        android:layout_marginEnd="64dp"
         android:background="@drawable/bg_map_panel"
         android:elevation="6dp"
         android:orientation="vertical"
@@ -33,8 +33,8 @@
 
             <ImageView
                 android:id="@+id/iconServer"
-                android:layout_width="18dp"
-                android:layout_height="18dp"
+                android:layout_width="24dp"
+                android:layout_height="24dp"
                 android:contentDescription="@string/status_server"
                 android:src="@drawable/ic_link_server" />
 
@@ -48,8 +48,8 @@
 
             <ImageView
                 android:id="@+id/iconLora"
-                android:layout_width="18dp"
-                android:layout_height="18dp"
+                android:layout_width="24dp"
+                android:layout_height="24dp"
                 android:layout_marginStart="8dp"
                 android:contentDescription="@string/status_lora"
                 android:src="@drawable/ic_link_lora" />
@@ -102,7 +102,7 @@
 
     <LinearLayout
         android:id="@+id/mapToolRail"
-        android:layout_width="48dp"
+        android:layout_width="56dp"
         android:layout_height="wrap_content"
         android:layout_gravity="end|center_vertical"
         android:layout_marginEnd="6dp"
@@ -116,8 +116,8 @@
         <ImageButton
             android:id="@+id/btnToolCenter"
             style="@style/Widget.Material3.Button.IconButton"
-            android:layout_width="40dp"
-            android:layout_height="40dp"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
             android:contentDescription="@string/map_tool_center"
             android:src="@drawable/ic_center"
             app:tint="@color/map_tool_icon_tint" />
@@ -125,8 +125,8 @@
         <ImageButton
             android:id="@+id/btnFindHill"
             style="@style/Widget.Material3.Button.IconButton"
-            android:layout_width="40dp"
-            android:layout_height="40dp"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
             android:contentDescription="@string/map_find_hill"
             android:src="@drawable/ic_hill"
             app:tint="@color/map_tool_icon_tint" />
@@ -134,8 +134,8 @@
         <ImageButton
             android:id="@+id/btnHeatmap"
             style="@style/Widget.Material3.Button.IconButton"
-            android:layout_width="40dp"
-            android:layout_height="40dp"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
             android:contentDescription="@string/map_heatmap"
             android:src="@drawable/ic_heatmap"
             app:tint="@color/map_tool_icon_tint" />
@@ -143,8 +143,8 @@
         <ImageButton
             android:id="@+id/btnTrack"
             style="@style/Widget.Material3.Button.IconButton"
-            android:layout_width="40dp"
-            android:layout_height="40dp"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
             android:contentDescription="@string/map_tool_track"
             android:src="@drawable/ic_track"
             app:tint="@color/map_tool_icon_tint" />
@@ -152,8 +152,8 @@
         <ImageButton
             android:id="@+id/btnPairedTrack"
             style="@style/Widget.Material3.Button.IconButton"
-            android:layout_width="40dp"
-            android:layout_height="40dp"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
             android:contentDescription="@string/map_tool_paired"
             android:src="@drawable/ic_paired_track"
             app:tint="@color/map_tool_icon_tint" />
@@ -161,8 +161,8 @@
         <ImageButton
             android:id="@+id/btnToolMore"
             style="@style/Widget.Material3.Button.IconButton"
-            android:layout_width="40dp"
-            android:layout_height="40dp"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
             android:contentDescription="@string/map_tool_more"
             android:src="@drawable/ic_more_vert"
             app:tint="@color/map_tool_icon_tint" />
@@ -174,7 +174,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="end|top"
         android:layout_marginTop="8dp"
-        android:layout_marginEnd="56dp"
+        android:layout_marginEnd="64dp"
         android:background="@drawable/bg_map_panel"
         android:elevation="6dp"
         android:scrollbars="none"
diff --git a/app/src/main/res/layout/fragment_settings.xml b/app/src/main/res/layout/fragment_settings.xml
index a873543..208da23 100644
--- a/app/src/main/res/layout/fragment_settings.xml
+++ b/app/src/main/res/layout/fragment_settings.xml
@@ -93,6 +93,20 @@
             android:layout_marginTop="16dp"
             android:text="@string/telnet_enabled" />
 
+        <com.google.android.material.switchmaterial.SwitchMaterial
+            android:id="@+id/switchLinkLossAlert"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/link_loss_alert" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp"
+            android:text="@string/link_loss_alert_hint"
+            android:textSize="12sp" />
+
         <TextView
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 43d91cf..4f8497e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -16,6 +16,8 @@
     <string name="rssi_regex">RSSI regex</string>
     <string name="range_regex">Range regex</string>
     <string name="telnet_enabled">Подключить telnet</string>
+    <string name="link_loss_alert">Сигнал при потере связи</string>
+    <string name="link_loss_alert_hint">Один короткий звук и вибрация, когда RX Quality падает до 0</string>
     <string name="device_id_label">ID устройства: %1$s</string>
     <string name="device_display_name">Имя на карте (realme, OPPO…)</string>
     <string name="save">Сохранить</string>
diff --git a/server/static/index.html b/server/static/index.html
index 0ea3061..ac5eb74 100644
--- a/server/static/index.html
+++ b/server/static/index.html
@@ -332,7 +332,7 @@
         </div>
         <div id="qualityVizPanel">
           <div class="quality-viz-box">
-            <div class="quality-viz-title">RX Quality vs расстояние TX↔RX</div>
+            <div class="quality-viz-title">RX Quality и плотность точек vs расстояние TX↔RX</div>
             <canvas id="qualityDistCanvas" width="800" height="140"></canvas>
           </div>
         </div>
diff --git a/server/static/quality-viz.js b/server/static/quality-viz.js
index 53e4099..6250707 100644
--- a/server/static/quality-viz.js
+++ b/server/static/quality-viz.js
@@ -2,6 +2,61 @@
 (function (global) {
   'use strict';
 
+  function niceMeterStep(span) {
+    if (span <= 50) return 10;
+    if (span <= 150) return 25;
+    if (span <= 400) return 50;
+    return 100;
+  }
+
+  function niceMeterTicks(minD, maxD) {
+    const span = Math.max(maxD - minD, 1);
+    const step = niceMeterStep(span);
+    const ticks = [];
+    const start = Math.ceil(minD / step) * step;
+    for (let d = start; d <= maxD + step * 0.01; d += step) {
+      if (d >= minD - step * 0.01 && d <= maxD + step * 0.01) {
+        ticks.push(d);
+      }
+    }
+    if (!ticks.length || ticks[0] > minD + 0.5) {
+      ticks.unshift(minD);
+    }
+    if (ticks[ticks.length - 1] < maxD - 0.5) {
+      ticks.push(maxD);
+    }
+    return ticks;
+  }
+
+  function drawMeterAxis(ctx, margin, plotW, plotH, h, minD, span, w) {
+    const ticks = niceMeterTicks(minD, minD + span);
+    const minLabelGap = 28;
+    const maxLabels = Math.max(2, Math.floor(plotW / minLabelGap));
+    const labelEvery = ticks.length > maxLabels
+      ? Math.ceil(ticks.length / maxLabels)
+      : 1;
+
+    ctx.strokeStyle = '#2a2a3a';
+    ctx.lineWidth = 1;
+    ticks.forEach((d, i) => {
+      const x = margin.l + ((d - minD) / span) * plotW;
+      ctx.beginPath();
+      ctx.moveTo(x, margin.t);
+      ctx.lineTo(x, margin.t + plotH);
+      ctx.stroke();
+
+      if (i % labelEvery === 0 || i === ticks.length - 1) {
+        const label = `${Math.round(d)}m`;
+        ctx.fillStyle = '#888';
+        ctx.font = '9px system-ui';
+        const tw = ctx.measureText(label).width;
+        let lx = x - tw / 2;
+        lx = Math.max(margin.l, Math.min(lx, margin.l + plotW - tw));
+        ctx.fillText(label, lx, h - 4);
+      }
+    });
+  }
+
   function drawQualityDistChart(canvas, samples, qualityColor, highlightDist) {
     if (!canvas) return;
     const ctx = canvas.getContext('2d');
@@ -23,7 +78,7 @@
     const minD = Math.min(...dists);
     const maxD = Math.max(...dists);
     const span = Math.max(maxD - minD, 1);
-    const binCount = Math.min(20, Math.max(5, Math.ceil(span / 10)));
+    const binCount = Math.min(40, Math.max(8, Math.ceil(span / 5)));
     const binW = span / binCount;
     const bins = Array.from({ length: binCount }, (_, i) => ({
       min: minD + i * binW,
@@ -37,53 +92,73 @@
       bins[idx].qualities.push(s.quality);
     }
 
-    const margin = { l: 36, r: 8, t: 16, b: 22 };
+    const margin = { l: 36, r: 8, t: 16, b: 30 };
     const plotW = w - margin.l - margin.r;
     const plotH = h - margin.t - margin.b;
+    const distBandH = Math.round(plotH * 0.25);
+    const qualBandH = plotH - distBandH - 4;
+    const qualTop = margin.t;
+    const distTop = margin.t + qualBandH + 4;
+    const axisY = margin.t + plotH;
 
     ctx.strokeStyle = '#333';
     ctx.beginPath();
-    ctx.moveTo(margin.l, margin.t);
-    ctx.lineTo(margin.l, margin.t + plotH);
-    ctx.lineTo(margin.l + plotW, margin.t + plotH);
+    ctx.moveTo(margin.l, qualTop);
+    ctx.lineTo(margin.l, axisY);
+    ctx.lineTo(margin.l + plotW, axisY);
     ctx.stroke();
 
     ctx.fillStyle = '#888';
     ctx.font = '9px system-ui';
-    ctx.fillText('0%', 2, margin.t + plotH);
-    ctx.fillText('100%', 2, margin.t + 8);
-    ctx.fillText(`${Math.round(minD)}m`, margin.l, h - 2);
-    ctx.fillText(`${Math.round(maxD)}m`, margin.l + plotW - 24, h - 2);
-    ctx.fillStyle = '#ccc';
-    ctx.font = '10px system-ui';
-    ctx.fillText('RX Quality vs расстояние', margin.l, margin.t - 4);
+    ctx.fillText('0%', 2, distTop - 2);
+    ctx.fillText('100%', 2, qualTop + 8);
+    ctx.fillStyle = '#666';
+    ctx.fillText('точки', 2, distTop + distBandH - 2);
+
+    drawMeterAxis(ctx, margin, plotW, plotH, h, minD, span, w);
+
+    const barW = plotW / binCount;
+    let maxCount = 1;
+    bins.forEach(b => {
+      if (b.qualities.length > maxCount) maxCount = b.qualities.length;
+    });
 
-    const barW = plotW / binCount * 0.75;
     bins.forEach((b, i) => {
-      if (!b.qualities.length) return;
-      const avg = b.qualities.reduce((a, v) => a + v, 0) / b.qualities.length;
-      const cx = margin.l + (i + 0.5) / binCount * plotW;
-      const barH = (avg / 100) * plotH;
-      const x = cx - barW / 2;
-      const y = margin.t + plotH - barH;
-      const col = qualityColor ? qualityColor(avg) : '#888';
+      const x = margin.l + i / binCount * plotW;
+      const count = b.qualities.length;
       const highlight = highlightDist != null
         && highlightDist >= b.min && highlightDist < b.max;
-      ctx.fillStyle = col;
-      ctx.globalAlpha = highlight ? 1 : 0.75;
-      ctx.fillRect(x, y, barW, barH);
-      ctx.globalAlpha = 1;
-      if (highlight) {
-        ctx.strokeStyle = '#fff';
-        ctx.lineWidth = 1.5;
-        ctx.strokeRect(x, y, barW, barH);
+
+      if (count === 0) {
+        ctx.fillStyle = 'rgba(255,255,255,0.08)';
+        ctx.fillRect(x, distTop + distBandH - 1, barW, 1);
+      } else {
+        const distBarH = (count / maxCount) * distBandH;
+        const intensity = 0.35 + 0.65 * (count / maxCount);
+        ctx.fillStyle = `rgba(74, 85, 104, ${intensity})`;
+        ctx.fillRect(x, distTop + distBandH - distBarH, barW, distBarH);
+
+        const avg = b.qualities.reduce((a, v) => a + v, 0) / count;
+        const qualBarH = (avg / 100) * qualBandH;
+        const y = qualTop + qualBandH - qualBarH;
+        const col = qualityColor ? qualityColor(avg) : '#888';
+        ctx.fillStyle = col;
+        ctx.globalAlpha = highlight ? 1 : 0.75;
+        ctx.fillRect(x, y, barW, qualBarH);
+        ctx.globalAlpha = 1;
+        if (highlight) {
+          ctx.strokeStyle = '#fff';
+          ctx.lineWidth = 1.5;
+          ctx.strokeRect(x, y, barW, qualBarH);
+          ctx.strokeRect(x, distTop + distBandH - distBarH, barW, distBarH);
+        }
       }
     });
 
     ctx.fillStyle = 'rgba(255,255,255,0.25)';
     samples.forEach(s => {
       const x = margin.l + ((s.distM - minD) / span) * plotW;
-      const y = margin.t + plotH - (s.quality / 100) * plotH;
+      const y = qualTop + qualBandH - (s.quality / 100) * qualBandH;
       ctx.beginPath();
       ctx.arc(x, y, 1.5, 0, Math.PI * 2);
       ctx.fill();