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 2341030..a5d1f3e 100644
--- a/app/src/main/java/com/grigowashere/loratester/ui/MapFragment.java
+++ b/app/src/main/java/com/grigowashere/loratester/ui/MapFragment.java
@@ -772,8 +772,21 @@ public class MapFragment extends Fragment {
 
     private static int qualityArgb(double pct) {
         double p = Math.max(0.0, Math.min(100.0, pct));
-        int r = p < 50.0 ? (int) Math.round(255.0 * (p / 50.0)) : 255;
-        int g = p < 50.0 ? 255 : (int) Math.round(255.0 * (1.0 - (p - 50.0) / 50.0));
+        int r;
+        int g;
+        if (p < 40.0) {
+            double t = p / 40.0;
+            r = 255;
+            g = (int) Math.round(140.0 * t);
+        } else if (p < 85.0) {
+            double t = (p - 40.0) / 45.0;
+            r = 255;
+            g = (int) Math.round(140.0 + 115.0 * t);
+        } else {
+            double t = (p - 85.0) / 15.0;
+            r = (int) Math.round(255.0 * (1.0 - t));
+            g = 255;
+        }
         return 0xFF000000 | (r << 16) | (g << 8);
     }
 
diff --git a/server/fastapi_app.py b/server/fastapi_app.py
index ba73e8c..45e01c8 100644
--- a/server/fastapi_app.py
+++ b/server/fastapi_app.py
@@ -379,7 +379,7 @@ def health():
     return {
         "ok": status["db_ok"],
         "ts": time.time(),
-        "api_build": "2026-06-16d",
+        "api_build": "2026-06-16e",
         **status,
         **elevation_status(),
     }
diff --git a/server/static/index.html b/server/static/index.html
index c210b9e..b9b1a85 100644
--- a/server/static/index.html
+++ b/server/static/index.html
@@ -361,7 +361,7 @@
       { position: 'topright', collapsed: true }
     ).addTo(map);
 
-    const API_BUILD = '2026-06-16d';
+    const API_BUILD = '2026-06-16e';
 
     const markers = {};
     let selectedId = null;
@@ -406,6 +406,8 @@
     let elevProfileTx = null;
     let elevProfileRx = null;
     let elevProfileSingle = null;
+    let elevProfileLink = null;
+    let elevProfileLinkKey = null;
     let elevProfileMapLine = null;
     let elevationLoadState = 'idle';
     let mapRulerOpen = false;
@@ -621,6 +623,11 @@
       };
     }
 
+    function mergeTelCoords(tel, pos) {
+      if (!tel || !pos) return tel;
+      return { ...tel, lat: pos.lat, lon: pos.lon };
+    }
+
     function snapAtTime(track, telemetryRows, t, roleFallback) {
       const pos = positionAt(track?.points, t);
       if (pos?.meta && String(pos.meta).length > 2) {
@@ -640,8 +647,21 @@
     function qualityColor(pct) {
       if (pct == null || Number.isNaN(pct)) return null;
       const p = Math.max(0, Math.min(100, Number(pct)));
-      const r = p < 50 ? Math.round(255 * (p / 50)) : 255;
-      const g = p < 50 ? 255 : Math.round(255 * (1 - (p - 50) / 50));
+      let r;
+      let g;
+      if (p < 40) {
+        const t = p / 40;
+        r = 255;
+        g = Math.round(140 * t);
+      } else if (p < 85) {
+        const t = (p - 40) / 45;
+        r = 255;
+        g = Math.round(140 + 115 * t);
+      } else {
+        const t = (p - 85) / 15;
+        r = Math.round(255 * (1 - t));
+        g = 255;
+      }
       return `rgb(${r},${g},0)`;
     }
 
@@ -747,9 +767,50 @@
       return html;
     }
 
+    function formatCoords(tel) {
+      if (!tel || tel.lat == null || tel.lon == null || isNullIsland(tel.lat, tel.lon)) return null;
+      return `${Number(tel.lat).toFixed(5)}, ${Number(tel.lon).toFixed(5)}`;
+    }
+
+    function formatPacketTime(tel) {
+      if (!tel) return null;
+      let ts = tel.ts;
+      if (tel.meta) {
+        let o = tel.meta;
+        if (typeof o === 'string') {
+          try { o = JSON.parse(o); } catch (e) { o = null; }
+        }
+        if (o) {
+          if (o.packet_ts != null) ts = o.packet_ts;
+          else if (o.ts != null) ts = o.ts;
+          else if (o.fields) {
+            for (const [k, v] of Object.entries(o.fields)) {
+              if (/time/i.test(k)) return String(v);
+            }
+          }
+        }
+      }
+      if (ts == null || !Number.isFinite(Number(ts)) || Number(ts) <= 1) return null;
+      const n = Number(ts);
+      const ms = n < 1e12 ? n * 1000 : n;
+      return new Date(ms).toLocaleTimeString();
+    }
+
+    function enrichSnapFromTel(snap, tel) {
+      snap.gps = formatCoords(tel) || '—';
+      snap.packetTime = formatPacketTime(tel) || '—';
+      return snap;
+    }
+
     function renderTimelineCompare(txTel, rxTel, txId, rxId) {
-      const txSnap = txTel ? telemetryToSnap(txTel) : RadioUI.parseRadioSnapshot(null);
-      const rxSnap = rxTel ? telemetryToSnap(rxTel) : RadioUI.parseRadioSnapshot(null);
+      const txSnap = enrichSnapFromTel(
+        txTel ? telemetryToSnap(txTel) : RadioUI.parseRadioSnapshot(null),
+        txTel
+      );
+      const rxSnap = enrichSnapFromTel(
+        rxTel ? telemetryToSnap(rxTel) : RadioUI.parseRadioSnapshot(null),
+        rxTel
+      );
       const chTx = RadioUI.diffSnapshots(prevTimelineTxSnap, txSnap);
       const chRx = RadioUI.diffSnapshots(prevTimelineRxSnap, rxSnap);
       prevTimelineTxSnap = txSnap;
@@ -1435,13 +1496,27 @@
     function getTimelineElevationSeries(cursors) {
       const series = [];
       if (dualTracksActive) {
+        if (elevationPointCount(elevProfileLink) > 0) {
+          const pts = elevProfileLink.points.filter(p => p.elevation_m != null);
+          const elevA = pts[0]?.elevation_m;
+          const elevB = pts[pts.length - 1]?.elevation_m;
+          series.push({
+            color: '#00ff88',
+            profile: elevProfileLink,
+            label: 'рельеф TX↔RX',
+            losLine: elevA != null && elevB != null ? { elevA, elevB } : null,
+          });
+          return series;
+        }
         if (elevationPointCount(elevProfileTx) > 0) {
           series.push({ color: TX_COLOR, profile: elevProfileTx, cursor: cursors?.tx, label: 'TX' });
         }
         if (elevationPointCount(elevProfileRx) > 0) {
           series.push({ color: RX_COLOR, profile: elevProfileRx, cursor: cursors?.rx, label: 'RX' });
         }
-      } else if (singleTrackActive && elevationPointCount(elevProfileSingle) > 0) {
+        return series;
+      }
+      if (singleTrackActive && elevationPointCount(elevProfileSingle) > 0) {
         const color = loadedSingleTrack?.role === 'RX' ? RX_COLOR : TX_COLOR;
         const label = loadedSingleTrack?.role === 'RX' ? 'RX' : 'TX';
         series.push({ color, profile: elevProfileSingle, cursor: cursors?.single, label });
@@ -1532,6 +1607,23 @@
           else ctx.lineTo(x, y);
         });
         ctx.stroke();
+        if (s.losLine && pts.length >= 2) {
+          const x0 = margin.l;
+          const x1 = margin.l + plotW;
+          const y0 = margin.t + plotH - ((s.losLine.elevA - minE) / (maxE - minE)) * plotH;
+          const y1 = margin.t + plotH - ((s.losLine.elevB - minE) / (maxE - minE)) * plotH;
+          ctx.strokeStyle = 'rgba(255, 136, 0, 0.95)';
+          ctx.lineWidth = 1.5;
+          ctx.setLineDash([5, 4]);
+          ctx.beginPath();
+          ctx.moveTo(x0, y0);
+          ctx.lineTo(x1, y1);
+          ctx.stroke();
+          ctx.setLineDash([]);
+          ctx.fillStyle = '#ffb74d';
+          ctx.font = '9px system-ui';
+          ctx.fillText('прямая', x1 - 42, y1 - 4);
+        }
         if (s.cursor != null && maxDist > 0) {
           const cx = margin.l + (s.cursor / maxDist) * plotW;
           const elev = elevationAtDist(s.profile, s.cursor);
@@ -1649,10 +1741,32 @@
       drawMapRulerChart();
     }
 
+    async function scheduleLinkElevation(txPos, rxPos) {
+      if (!txPos || !rxPos) return;
+      const dist = haversineM(txPos.lat, txPos.lon, rxPos.lat, rxPos.lon);
+      const key = `${txPos.lat.toFixed(5)},${txPos.lon.toFixed(5)}|${rxPos.lat.toFixed(5)},${rxPos.lon.toFixed(5)}`;
+      if (key === elevProfileLinkKey && elevProfileLink) return;
+      elevProfileLinkKey = key;
+      const linePts = [{ lat: txPos.lat, lon: txPos.lon }, { lat: rxPos.lat, lon: rxPos.lon }];
+      const profile = await fetchElevationProfile(linePts, null, {
+        targetPoints: getMapRulerTargetPoints(dist),
+      });
+      if (elevProfileLinkKey !== key) return;
+      elevProfileLink = profile;
+      const n = elevationPointCount(profile);
+      if (n > 0) {
+        const src = profile.source === 'elevation' ? 'высоты'
+          : profile.source === 'server' ? 'сервер' : (profile.source || 'данные');
+        setElevationStatus(`срез TX↔RX · ${dist.toFixed(0)} m · ${src} · ${n} точек · оранжевая — прямая`);
+      }
+    }
+
     async function loadElevationProfiles() {
       elevProfileTx = null;
       elevProfileRx = null;
       elevProfileSingle = null;
+      elevProfileLink = null;
+      elevProfileLinkKey = null;
       elevationLoadState = 'loading';
       setElevationStatus('загрузка…');
       drawElevationChart();
@@ -1661,25 +1775,26 @@
         elevProfileSingle = await fetchElevationProfile(
           loadedSingleTrack.points, loadedSingleTrack.id);
       } else if (dualTracksActive) {
-        const [txProf, rxProf] = await Promise.all([
-          loadedTxTrack?.points?.length
-            ? fetchElevationProfile(loadedTxTrack.points, loadedTxTrack.id) : null,
-          loadedRxTrack?.points?.length
-            ? fetchElevationProfile(loadedRxTrack.points, loadedRxTrack.id) : null
-        ]);
-        elevProfileTx = txProf;
-        elevProfileRx = rxProf;
+        const txPos = positionAtCursor(loadedTxTrack?.points, timelineCursor());
+        const rxPos = positionAtCursor(loadedRxTrack?.points, timelineCursor());
+        if (txPos && rxPos) {
+          await scheduleLinkElevation(txPos, rxPos);
+        }
       }
 
       elevationLoadState = 'done';
       const hasData = elevationPointCount(elevProfileSingle) > 0
+        || elevationPointCount(elevProfileLink) > 0
         || elevationPointCount(elevProfileTx) > 0
         || elevationPointCount(elevProfileRx) > 0;
       if (hasData) {
-        const ref = elevProfileSingle || elevProfileTx || elevProfileRx;
+        const ref = elevProfileSingle || elevProfileLink || elevProfileTx || elevProfileRx;
         const srcLabel = ref?.source === 'elevation' ? 'высоты'
           : ref?.source === 'server' ? 'сервер' : (ref?.source || 'данные');
-        if (dualTracksActive && elevProfileTx && elevProfileRx) {
+        if (dualTracksActive && elevProfileLink) {
+          const n = elevationPointCount(elevProfileLink);
+          setElevationStatus(`срез TX↔RX · ${srcLabel} · ${n} точек · оранжевая — прямая`);
+        } else if (dualTracksActive && elevProfileTx && elevProfileRx) {
           const nTx = elevationPointCount(elevProfileTx);
           const nRx = elevationPointCount(elevProfileRx);
           setElevationStatus(`TX + RX · ${srcLabel} · ${nTx}/${nRx} точек`);
@@ -1687,7 +1802,8 @@
           setElevationStatus(`${srcLabel} · ${elevationPointCount(ref)} точек`);
         }
       } else {
-        const err = elevProfileSingle?.api_error || elevProfileTx?.api_error || elevProfileRx?.api_error;
+        const err = elevProfileSingle?.api_error || elevProfileLink?.api_error
+          || elevProfileTx?.api_error || elevProfileRx?.api_error;
         setElevationStatus(err ? `ошибка: ${err}` : 'нет данных');
       }
       drawElevationChart();
@@ -1976,6 +2092,8 @@
       elevProfileTx = null;
       elevProfileRx = null;
       elevProfileSingle = null;
+      elevProfileLink = null;
+      elevProfileLinkKey = null;
       drawElevationChart();
       if (playTimer) {
         clearInterval(playTimer);
@@ -2039,12 +2157,17 @@
       const dist = haversineM(txPos.lat, txPos.lon, rxPos.lat, rxPos.lon);
       let html = `<b>${formatTimelineClock(cursor)}</b><br>`;
       html += `Расстояние: ${dist.toFixed(0)} m (GPS)<br><br>`;
-      html += `<span class="legend-tx">TX</span> ${txPos.lat.toFixed(5)}, ${txPos.lon.toFixed(5)}<br>`;
-      const txTel = snapAtCursor(loadedTxTrack, telemetryTx, cursor, 'TX');
-      const rxTel = snapAtCursor(loadedRxTrack, telemetryRx, cursor, 'RX');
+      const txTel = mergeTelCoords(snapAtCursor(loadedTxTrack, telemetryTx, cursor, 'TX'), txPos);
+      const rxTel = mergeTelCoords(snapAtCursor(loadedRxTrack, telemetryRx, cursor, 'RX'), rxPos);
       html += renderTimelineCompare(
-        txTel || { meta: txPos.meta, role: 'TX', rssi: null },
-        rxTel || { meta: rxPos.meta, role: 'RX', rssi: null },
+        txTel || mergeTelCoords({
+          meta: txPos.meta, role: 'TX', rssi: null,
+          ts: timelineUseProgress ? null : cursor.t
+        }, txPos),
+        rxTel || mergeTelCoords({
+          meta: rxPos.meta, role: 'RX', rssi: null,
+          ts: timelineUseProgress ? null : cursor.t
+        }, rxPos),
         deviceDisplayName(loadedTxTrack?.device_id),
         deviceDisplayName(loadedRxTrack?.device_id)
       );
@@ -2098,8 +2221,8 @@
         }
       }
 
-      const txTel = snapAtCursor(loadedTxTrack, telemetryTx, cursor, 'TX');
-      const rxTel = snapAtCursor(loadedRxTrack, telemetryRx, cursor, 'RX');
+      const txTel = mergeTelCoords(snapAtCursor(loadedTxTrack, telemetryTx, cursor, 'TX'), txPos);
+      const rxTel = mergeTelCoords(snapAtCursor(loadedRxTrack, telemetryRx, cursor, 'RX'), rxPos);
       const timelineStatsEl = document.getElementById('timelineStats');
       setPanelHtml(timelineStatsEl, renderTimelineCompare(
         txTel,
@@ -2107,10 +2230,11 @@
         deviceDisplayName(loadedTxTrack?.device_id),
         deviceDisplayName(loadedRxTrack?.device_id)
       ));
-      drawElevationChart({
-        tx: trackDistanceAtCursor(loadedTxTrack, cursor),
-        rx: trackDistanceAtCursor(loadedRxTrack, cursor)
-      });
+      if (txPos && rxPos) {
+        scheduleLinkElevation(txPos, rxPos).then(() => drawElevationChart());
+      } else {
+        drawElevationChart();
+      }
     }
 
     function updateTimelineAtSingle(cursor, openModal) {
diff --git a/server/static/radio-ui.js b/server/static/radio-ui.js
index 3bdeea6..c0194ec 100644
--- a/server/static/radio-ui.js
+++ b/server/static/radio-ui.js
@@ -77,9 +77,9 @@
   function diffSnapshots(a, b) {
     const changed = new Set();
     if (!a || !b) return changed;
-    const keys = ['role', 'rssiDbm', 'snrDb', 'rxQualityPercent', 'packet', 'payload', 'perPercent',
+    const keys = ['gps', 'packetTime', 'role', 'rssiDbm', 'snrDb', 'rxQualityPercent', 'packet', 'payload', 'perPercent',
       'txPktPerS', 'rxPktPerS', 'frequencyMhz', 'sf', 'bwKhz', 'powerDbm'];
-    const map = { role: 'role', rssiDbm: 'rssi', snrDb: 'snr', rxQualityPercent: 'rxQuality',
+    const map = { gps: 'gps', packetTime: 'packetTime', role: 'role', rssiDbm: 'rssi', snrDb: 'snr', rxQualityPercent: 'rxQuality',
       packet: 'packet',
       payload: 'payload', perPercent: 'per', txPktPerS: 'txSpeed', rxPktPerS: 'rxSpeed',
       frequencyMhz: 'frequency', sf: 'sf', bwKhz: 'bw', powerDbm: 'power' };
@@ -90,6 +90,8 @@
   }
 
   const DYNAMIC_ROWS = [
+    { key: 'gps', label: 'GPS', fmt: s => s.gps || '—' },
+    { key: 'packetTime', label: 'Время пакета', fmt: s => s.packetTime || '—' },
     { key: 'rssi', label: 'RSSI', fmt: s => s.rssiDbm != null ? `${s.rssiDbm} dBm` : '—' },
     { key: 'snr', label: 'SNR', fmt: s => s.snrDb != null ? `${s.snrDb} dB` : '—' },
     { key: 'rxQuality', label: 'RX Quality', fmt: s => s.rxQualityPercent != null ? `${s.rxQualityPercent} %` : '—' },