merge to my test branch

src/components/DXFilterManager.jsx

@@ -279,7 +279,7 @@ export const DXFilterManager = ({ filters, onFilterChange, isOpen, onClose }) =>
     <div>
       <div style={{ marginBottom: '16px' }}>
         <div style={{ fontSize: '13px', fontWeight: '600', color: 'var(--text-primary)', marginBottom: '8px' }}>
-          Exclude List - Hide these callsigns
+          Exclude List - Hide DX callsigns beginning with:
         </div>
         <div style={{ display: 'flex', gap: '8px' }}>
           <input

src/hooks/useDXCluster.js

@@ -26,17 +26,15 @@ export const useDXCluster = (source = 'auto', filters = {}) => {
       // Watchlist only mode - must match watchlist
       if (filters.watchlistOnly && filters.watchlist?.length > 0) {
         const matchesWatchlist = filters.watchlist.some(w => 
-          spot.call?.toUpperCase().includes(w.toUpperCase()) ||
+          spot.call?.toUpperCase().includes(w.toUpperCase())
-          spot.spotter?.toUpperCase().includes(w.toUpperCase())
         );
         if (!matchesWatchlist) return false;
       }
       
-      // Exclude list - hide matching calls
+      // Exclude list - hide matching calls - match the call as a prefix
       if (filters.excludeList?.length > 0) {
         const isExcluded = filters.excludeList.some(exc =>
-          spot.call?.toUpperCase().includes(exc.toUpperCase()) ||
+          spot.call?.toUpperCase().startsWith(exc.toUpperCase())
-          spot.spotter?.toUpperCase().includes(exc.toUpperCase())
         );
         if (isExcluded) return false;
       }

src/plugins/layers/useEarthquakes.js

@@ -81,11 +81,27 @@ export function useLayer({ enabled = false, opacity = 0.9, map = null }) {
       const coords = quake.geometry.coordinates;
       const props = quake.properties;
       const mag = props.mag;
-      const lat = coords[1];
+      
-      const lon = coords[0];
+      // GeoJSON standard format: [longitude, latitude, elevation]
+      // For Santa Lucía, Peru: [-70.5639, -15.6136, 206.486]
+      //   coords[0] = -70.5639 = Longitude (W)
+      //   coords[1] = -15.6136 = Latitude (S)
+      //   coords[2] = 206.486 = Depth (km)
+      const lat = coords[1];  // Latitude (y-axis)
+      const lon = coords[0];  // Longitude (x-axis)
       const depth = coords[2];
       const quakeId = quake.id;
 
+      // Debug logging with detailed info
+      console.log(`🌋 Earthquake ${quakeId}:`, {
+        place: props.place,
+        mag: mag,
+        geojson: `[lon=${coords[0]}, lat=${coords[1]}, depth=${coords[2]}]`,
+        extracted: `lat=${lat} (coords[1]), lon=${lon} (coords[0])`,
+        leafletMarkerCall: `L.marker([${lat}, ${lon}])`,
+        explanation: `Standard Leaflet [latitude, longitude] format - CSS position fixed`
+      });
+
       currentQuakeIds.add(quakeId);
 
       // Skip if invalid coordinates
@@ -133,11 +149,20 @@ export function useLayer({ enabled = false, opacity = 0.9, map = null }) {
           box-shadow: 0 2px 8px rgba(0,0,0,0.5);
         ">${waveIcon}</div>`,
         iconSize: [size, size],
-        iconAnchor: [size/2, size/2]
+        iconAnchor: [size/2, size/2],
+        popupAnchor: [0, 0]  // Popup appears at the marker position (icon center)
       });
       
-      console.log('Creating earthquake marker:', quakeId, 'M' + mag.toFixed(1), 'at', lat, lon, 'size:', size + 'px', 'color:', color);
+      console.log(`📍 Creating marker for ${quakeId}: M${mag.toFixed(1)} at [lat=${lat}, lon=${lon}] - ${props.place}`);
-      const circle = L.marker([lat, lon], { 
+      
+      // Use standard Leaflet [latitude, longitude] format
+      // The popup was appearing in the correct location, confirming marker position is correct
+      // The icon was appearing offset due to CSS position: relative issue (now fixed)
+      const markerCoords = [lat, lon];  // CORRECT: [latitude, longitude]
+      
+      console.log(`   → Creating L.marker([${markerCoords[0]}, ${markerCoords[1]}]) = [lat, lon]`);
+      
+      const circle = L.marker(markerCoords, { 
         icon, 
         opacity,
         zIndexOffset: 10000 // Ensure markers appear on top
@@ -170,7 +195,7 @@ export function useLayer({ enabled = false, opacity = 0.9, map = null }) {
           }
         }, 10);
         
-        // Create pulsing ring effect
+        // Create pulsing ring effect - use same [lat, lon] format
         const pulseRing = L.circle([lat, lon], {
           radius: 50000, // 50km radius in meters
           fillColor: color,

src/plugins/layers/useGrayLine.js

@@ -100,6 +100,87 @@ function calculateSolarAltitude(date, latitude, longitude) {
   return altitude;
 }
 
+// Split polyline at date line to avoid lines cutting across the map
+function splitAtDateLine(points) {
+  if (points.length < 2) return [points];
+  
+  // Check if line spans the full world (-180 to 180)
+  const lons = points.map(p => p[1]);
+  const minLon = Math.min(...lons);
+  const maxLon = Math.max(...lons);
+  const span = maxLon - minLon;
+  
+  console.log('🔍 splitAtDateLine debug:', {
+    totalPoints: points.length,
+    lonRange: `${minLon.toFixed(1)} to ${maxLon.toFixed(1)}`,
+    span: span.toFixed(1)
+  });
+  
+  // If the line spans close to 360°, it wraps around the world
+  // We need to split it at the ±180° boundary
+  if (span > 350) {
+    console.log('🔍 Full-world span detected, splitting at ±180°');
+    
+    // Strategy: Create two segments that meet at ±180° longitude
+    // Segment 1: Western hemisphere (-180° to slightly past 0°)
+    // Segment 2: Eastern hemisphere (slightly before 0° to +180°)
+    
+    const westSegment = [];  // Points from -180° to ~0°
+    const eastSegment = [];  // Points from ~0° to +180°
+    
+    // Sort points by longitude to ensure correct ordering
+    const sortedPoints = [...points].sort((a, b) => a[1] - b[1]);
+    
+    // Find the midpoint longitude (should be around 0°)
+    const midIndex = Math.floor(sortedPoints.length / 2);
+    
+    // Split at midpoint, with some overlap
+    westSegment.push(...sortedPoints.slice(0, midIndex + 1));
+    eastSegment.push(...sortedPoints.slice(midIndex));
+    
+    const segments = [];
+    if (westSegment.length >= 2) segments.push(westSegment);
+    if (eastSegment.length >= 2) segments.push(eastSegment);
+    
+    console.log('🔍 Split into segments:', segments.map(s => {
+      const lons = s.map(p => p[1]);
+      return {
+        points: s.length,
+        lonRange: `${Math.min(...lons).toFixed(1)} to ${Math.max(...lons).toFixed(1)}`
+      };
+    }));
+    return segments;
+  }
+  
+  // Otherwise, check for sudden longitude jumps (traditional date line crossing)
+  const segments = [];
+  let currentSegment = [points[0]];
+  
+  for (let i = 1; i < points.length; i++) {
+    const prev = points[i - 1];
+    const curr = points[i];
+    const prevLon = prev[1];
+    const currLon = curr[1];
+    const lonDiff = Math.abs(currLon - prevLon);
+    
+    // If longitude jumps more than 180°, we've crossed the date line
+    if (lonDiff > 180) {
+      console.log(`🔍 Date line jump detected at index ${i}: ${prevLon.toFixed(1)}° → ${currLon.toFixed(1)}°`);
+      segments.push(currentSegment);
+      currentSegment = [curr];
+    } else {
+      currentSegment.push(curr);
+    }
+  }
+  
+  if (currentSegment.length > 0) {
+    segments.push(currentSegment);
+  }
+  
+  console.log('🔍 splitAtDateLine result:', segments.length, 'segments');
+  return segments.filter(seg => seg.length >= 2);
+}
+
 // Generate terminator line for a specific solar altitude
 function generateTerminatorLine(date, solarAltitude = 0, numPoints = 360) {
   const points = [];
@@ -113,64 +194,78 @@ function generateTerminatorLine(date, solarAltitude = 0, numPoints = 360) {
     const hourAngle = calculateHourAngle(date, lon);
     const haRad = hourAngle * Math.PI / 180;
     
-    // Use the solar altitude equation to solve for latitude
-    // sin(altitude) = sin(lat) * sin(dec) + cos(lat) * cos(dec) * cos(HA)
-    // Rearranging: sin(altitude) - sin(lat) * sin(dec) = cos(lat) * cos(dec) * cos(HA)
-    
-    // For terminator (altitude = 0), the equation simplifies
-    // We need to solve: tan(lat) = -tan(dec) / cos(HA)
-    
     const cosHA = Math.cos(haRad);
     const sinDec = Math.sin(decRad);
     const cosDec = Math.cos(decRad);
     const sinAlt = Math.sin(altRad);
     
-    // Solve using the quadratic formula or direct calculation
-    // sin(lat) = (sin(alt) - cos(lat) * cos(dec) * cos(HA)) / sin(dec)
-    
-    // Better approach: use atan2 for proper terminator calculation
-    // The terminator latitude for a given longitude is:
-    // lat = atan(-cos(HA) / tan(dec)) when dec != 0
-    
     let lat;
     
+    // Check if solution exists (sun can reach this altitude at this longitude)
+    // For terminator and twilight, check if |cos(HA) * cos(dec)| <= 1 - sin(alt) * sin(dec)
+    const testValue = (sinAlt - sinDec * sinDec) / (cosDec * cosDec * cosHA * cosHA);
+    
     if (Math.abs(declination) < 0.01) {
       // Near equinox: terminator is nearly straight along equator
       lat = 0;
+    } else if (Math.abs(cosDec) < 0.001) {
+      // Near solstice: sun is directly over tropic, skip this point
+      continue;
     } else {
       // Standard case: calculate terminator latitude
-      // Formula: cos(lat) * cos(dec) * cos(HA) = -sin(lat) * sin(dec) (for altitude = 0)
-      // This gives: tan(lat) = -cos(HA) / tan(dec)
-      
       const tanDec = Math.tan(decRad);
-      if (Math.abs(tanDec) < 0.0001) {
-        lat = 0;
-      } else {
-        lat = Math.atan(-cosHA / tanDec) * 180 / Math.PI;
-      }
       
-      // For twilight (altitude < 0), we need to adjust
+      if (solarAltitude === 0) {
-      if (solarAltitude !== 0) {
+        // Terminator (sunrise/sunset line)
-        // Use iterative solution for twilight calculations
+        // Formula: tan(lat) = -cos(HA) / tan(dec)
-        // cos(lat) * cos(dec) * cos(HA) + sin(lat) * sin(dec) = sin(alt)
+        if (Math.abs(tanDec) > 0.0001) {
+          lat = Math.atan(-cosHA / tanDec) * 180 / Math.PI;
+        } else {
+          lat = 0;
+        }
+      } else {
+        // Twilight zones (negative solar altitude)
+        // Use Newton-Raphson iteration to solve for latitude
+        // Equation: sin(lat) * sin(dec) + cos(lat) * cos(dec) * cos(HA) = sin(alt)
         
-        // Newton-Raphson iteration to solve for latitude
+        // Initial guess based on terminator
-        let testLat = lat * Math.PI / 180;
+        let testLat = Math.atan(-cosHA / tanDec);
-        for (let iter = 0; iter < 5; iter++) {
+        
+        // Iterate to find solution
+        let converged = false;
+        for (let iter = 0; iter < 10; iter++) {
           const f = Math.sin(testLat) * sinDec + Math.cos(testLat) * cosDec * cosHA - sinAlt;
           const fPrime = Math.cos(testLat) * sinDec - Math.sin(testLat) * cosDec * cosHA;
+          
+          if (Math.abs(f) < 0.0001) {
+            converged = true;
+            break;
+          }
+          
           if (Math.abs(fPrime) > 0.0001) {
             testLat = testLat - f / fPrime;
+          } else {
+            break;
           }
+          
+          // Constrain to valid latitude range during iteration
+          testLat = Math.max(-Math.PI/2, Math.min(Math.PI/2, testLat));
+        }
+        
+        // Only use the point if iteration converged
+        if (!converged) {
+          continue;
         }
+        
         lat = testLat * 180 / Math.PI;
       }
     }
     
-    // Clamp latitude to valid range
+    // Strict clamping to valid latitude range
-    lat = Math.max(-90, Math.min(90, lat));
+    lat = Math.max(-85, Math.min(85, lat));
     
-    if (isFinite(lat) && isFinite(lon)) {
+    // Only add point if it's valid and not at extreme latitude
+    if (isFinite(lat) && isFinite(lon) && Math.abs(lat) < 85) {
       points.push([lat, lon]);
     }
   }
@@ -488,104 +583,159 @@ export function useLayer({ enabled = false, opacity = 0.5, map = null }) {
     
     // Main terminator (solar altitude = 0°)
     const terminator = generateTerminatorLine(currentTime, 0, 360);
-    const terminatorLine = L.polyline(terminator, {
+    const terminatorSegments = splitAtDateLine(terminator);
-      color: '#ff6600',
+    
-      weight: 3,
+    terminatorSegments.forEach(segment => {
-      opacity: opacity * 0.8,
+      const terminatorLine = L.polyline(segment, {
-      dashArray: '10, 5'
+        color: '#ff6600',
+        weight: 3,
+        opacity: opacity * 0.8,
+        dashArray: '10, 5'
+      });
+      terminatorLine.bindPopup(`
+        <div style="font-family: 'JetBrains Mono', monospace;">
+          <b>🌅 Solar Terminator</b><br>
+          Sun altitude: 0°<br>
+          Enhanced HF propagation zone<br>
+          UTC: ${currentTime.toUTCString()}
+        </div>
+      `);
+      terminatorLine.addTo(map);
+      newLayers.push(terminatorLine);
     });
-    terminatorLine.bindPopup(`
-      <div style="font-family: 'JetBrains Mono', monospace;">
-        <b>🌅 Solar Terminator</b><br>
-        Sun altitude: 0°<br>
-        Enhanced HF propagation zone<br>
-        UTC: ${currentTime.toUTCString()}
-      </div>
-    `);
-    terminatorLine.addTo(map);
-    newLayers.push(terminatorLine);
     
     // Enhanced DX zone (±5° from terminator)
     if (showEnhancedZone) {
       const enhancedUpper = generateTerminatorLine(currentTime, 5, 360);
       const enhancedLower = generateTerminatorLine(currentTime, -5, 360);
       
-      // Create polygon for enhanced zone
+      // Only create polygon if we have valid points
-      const enhancedZone = [...enhancedUpper, ...enhancedLower.reverse()];
+      if (enhancedUpper.length > 2 && enhancedLower.length > 2) {
-      const enhancedPoly = L.polygon(enhancedZone, {
+        // Split both upper and lower lines at date line
-        color: '#ffaa00',
+        const upperSegments = splitAtDateLine(enhancedUpper);
-        fillColor: '#ffaa00',
+        const lowerSegments = splitAtDateLine(enhancedLower);
-        fillOpacity: opacity * 0.15,
+        
-        weight: 1,
+        console.log('🔶 Enhanced DX Zone segments:', {
-        opacity: opacity * 0.3
+          upperCount: upperSegments.length,
-      });
+          lowerCount: lowerSegments.length,
-      enhancedPoly.bindPopup(`
+          upperSegmentLengths: upperSegments.map(s => s.length),
-        <div style="font-family: 'JetBrains Mono', monospace;">
+          lowerSegmentLengths: lowerSegments.map(s => s.length)
-          <b>⭐ Enhanced DX Zone</b><br>
+        });
-          Best HF propagation window<br>
+        
-          ±5° from terminator<br>
+        // Create polygon for each corresponding segment pair
-          Ideal for long-distance contacts
+        // Both upper and lower should have same number of segments
-        </div>
+        const numSegments = Math.min(upperSegments.length, lowerSegments.length);
-      `);
+        
-      enhancedPoly.addTo(map);
+        for (let i = 0; i < numSegments; i++) {
-      newLayers.push(enhancedPoly);
+          const upperSeg = upperSegments[i];
+          const lowerSeg = lowerSegments[i];
+          
+          if (upperSeg.length > 1 && lowerSeg.length > 1) {
+            // Create polygon from upper segment + reversed lower segment
+            // This creates a closed shape between the two lines
+            const enhancedZone = [...upperSeg, ...lowerSeg.slice().reverse()];
+            
+            // Debug: Show longitude range of this polygon
+            const polyLons = enhancedZone.map(p => p[1]);
+            const polyMinLon = Math.min(...polyLons);
+            const polyMaxLon = Math.max(...polyLons);
+            
+            console.log(`🔶 Creating Enhanced DX polygon segment ${i+1}/${numSegments}:`, {
+              upperPoints: upperSeg.length,
+              lowerPoints: lowerSeg.length,
+              totalPolygonPoints: enhancedZone.length,
+              lonRange: `${polyMinLon.toFixed(1)} to ${polyMaxLon.toFixed(1)}`
+            });
+            
+            const enhancedPoly = L.polygon(enhancedZone, {
+              color: '#ffaa00',
+              fillColor: '#ffaa00',
+              fillOpacity: opacity * 0.15,
+              weight: 1,
+              opacity: opacity * 0.3
+            });
+            enhancedPoly.bindPopup(`
+              <div style="font-family: 'JetBrains Mono', monospace;">
+                <b>⭐ Enhanced DX Zone</b><br>
+                Best HF propagation window<br>
+                ±5° from terminator<br>
+                Ideal for long-distance contacts
+              </div>
+            `);
+            enhancedPoly.addTo(map);
+            newLayers.push(enhancedPoly);
+          }
+        }
+      }
     }
     
     // Twilight zones
     if (showTwilight) {
       // Civil twilight (sun altitude -6°)
       const civilTwilight = generateTerminatorLine(currentTime, -6, 360);
-      const civilLine = L.polyline(civilTwilight, {
+      const civilSegments = splitAtDateLine(civilTwilight);
-        color: '#4488ff',
+      
-        weight: 2,
+      civilSegments.forEach(segment => {
-        opacity: twilightOpacity * 0.6,
+        const civilLine = L.polyline(segment, {
-        dashArray: '5, 5'
+          color: '#4488ff',
+          weight: 2,
+          opacity: twilightOpacity * 0.6,
+          dashArray: '5, 5'
+        });
+        civilLine.bindPopup(`
+          <div style="font-family: 'JetBrains Mono', monospace;">
+            <b>🌆 Civil Twilight</b><br>
+            Sun altitude: -6°<br>
+            Good propagation conditions
+          </div>
+        `);
+        civilLine.addTo(map);
+        newLayers.push(civilLine);
       });
-      civilLine.bindPopup(`
-        <div style="font-family: 'JetBrains Mono', monospace;">
-          <b>🌆 Civil Twilight</b><br>
-          Sun altitude: -6°<br>
-          Good propagation conditions
-        </div>
-      `);
-      civilLine.addTo(map);
-      newLayers.push(civilLine);
       
       // Nautical twilight (sun altitude -12°)
       const nauticalTwilight = generateTerminatorLine(currentTime, -12, 360);
-      const nauticalLine = L.polyline(nauticalTwilight, {
+      const nauticalSegments = splitAtDateLine(nauticalTwilight);
-        color: '#6666ff',
+      
-        weight: 1.5,
+      nauticalSegments.forEach(segment => {
-        opacity: twilightOpacity * 0.4,
+        const nauticalLine = L.polyline(segment, {
-        dashArray: '3, 3'
+          color: '#6666ff',
+          weight: 1.5,
+          opacity: twilightOpacity * 0.4,
+          dashArray: '3, 3'
+        });
+        nauticalLine.bindPopup(`
+          <div style="font-family: 'JetBrains Mono', monospace;">
+            <b>🌃 Nautical Twilight</b><br>
+            Sun altitude: -12°<br>
+            Moderate propagation
+          </div>
+        `);
+        nauticalLine.addTo(map);
+        newLayers.push(nauticalLine);
       });
-      nauticalLine.bindPopup(`
-        <div style="font-family: 'JetBrains Mono', monospace;">
-          <b>🌃 Nautical Twilight</b><br>
-          Sun altitude: -12°<br>
-          Moderate propagation
-        </div>
-      `);
-      nauticalLine.addTo(map);
-      newLayers.push(nauticalLine);
       
       // Astronomical twilight (sun altitude -18°)
       const astroTwilight = generateTerminatorLine(currentTime, -18, 360);
-      const astroLine = L.polyline(astroTwilight, {
+      const astroSegments = splitAtDateLine(astroTwilight);
-        color: '#8888ff',
+      
-        weight: 1,
+      astroSegments.forEach(segment => {
-        opacity: twilightOpacity * 0.3,
+        const astroLine = L.polyline(segment, {
-        dashArray: '2, 2'
+          color: '#8888ff',
+          weight: 1,
+          opacity: twilightOpacity * 0.3,
+          dashArray: '2, 2'
+        });
+        astroLine.bindPopup(`
+          <div style="font-family: 'JetBrains Mono', monospace;">
+            <b>🌌 Astronomical Twilight</b><br>
+            Sun altitude: -18°<br>
+            Transition to night propagation
+          </div>
+        `);
+        astroLine.addTo(map);
+        newLayers.push(astroLine);
       });
-      astroLine.bindPopup(`
-        <div style="font-family: 'JetBrains Mono', monospace;">
-          <b>🌌 Astronomical Twilight</b><br>
-          Sun altitude: -18°<br>
-          Transition to night propagation
-        </div>
-      `);
-      astroLine.addTo(map);
-      newLayers.push(astroLine);
     }
     
     setLayers(newLayers);

src/styles/main.css

@@ -876,7 +876,7 @@ body::before {
 .earthquake-icon {
   z-index: 10000 !important;
   pointer-events: auto;
-  position: relative !important;
+  /* Removed position: relative - was causing icons to appear offset from marker position */
 }
 
 .earthquake-icon div {
@@ -885,7 +885,7 @@ body::before {
   justify-content: center;
   cursor: pointer;
   user-select: none;
-  position: relative;
+  /* position: relative removed here too */
   z-index: 10000 !important;
 }
 

src/utils/callsign.js

@@ -242,8 +242,7 @@ export const filterDXPaths = (paths, filters) => {
     // Exclude list - hide matching callsigns
     if (filters.excludeList?.length > 0) {
       const isExcluded = filters.excludeList.some(e =>
-        path.dxCall?.toUpperCase().includes(e.toUpperCase()) ||
+        path.dxCall?.toUpperCase().startsWith(e.toUpperCase())
-        path.spotter?.toUpperCase().includes(e.toUpperCase())
       );
       if (isExcluded) return false;
     }

test_coords.py

@@ -0,0 +1,26 @@
+# Test coordinate wrapping for Kamchatka, Russia
+# Kamchatka is around: 56°N, 162°E
+
+lat = 56.0  # Correct latitude
+lon = 162.0  # Correct longitude (Eastern hemisphere)
+
+print(f"Kamchatka, Russia:")
+print(f"  Correct coordinates: lat={lat}, lon={lon}")
+print(f"  Leaflet marker: L.marker([{lat}, {lon}])")
+print(f"  This should plot in: Eastern Russia (Kamchatka Peninsula)")
+print()
+
+# What if longitude is negative?
+lon_neg = -162.0
+print(f"If longitude was negative:")
+print(f"  L.marker([{lat}, {lon_neg}])")
+print(f"  This would plot in: Western Alaska (near Bering Strait)")
+print()
+
+# Peru example
+peru_lat = -15.6
+peru_lon = -70.6
+print(f"Peru earthquake:")
+print(f"  Correct coordinates: lat={peru_lat}, lon={peru_lon}")
+print(f"  Leaflet marker: L.marker([{peru_lat}, {peru_lon}])")
+print(f"  This should plot in: Peru, South America")

test_earthquake_coords.js

@@ -0,0 +1,28 @@
+// Test to understand the coordinate flow
+
+// Sample Dominican Republic earthquake from USGS
+const geojsonData = {
+  geometry: {
+    coordinates: [-68.625, 18.0365, 75.0]  // [lon, lat, depth] - GeoJSON format
+  },
+  properties: {
+    place: "37 km S of Boca de Yuma, Dominican Republic"
+  }
+};
+
+// Current code extraction
+const coords = geojsonData.geometry.coordinates;
+const lat = coords[1];  // 18.0365
+const lon = coords[0];  // -68.625
+
+console.log("GeoJSON coordinates:", coords);
+console.log("Extracted lat:", lat, "(should be 18.0365)");
+console.log("Extracted lon:", lon, "(should be -68.625)");
+console.log("");
+console.log("If we call L.marker([lat, lon]):");
+console.log("  L.marker([" + lat + ", " + lon + "])");
+console.log("  This should plot at: 18.0365°N, 68.625°W (Dominican Republic)");
+console.log("");
+console.log("If we call L.marker([lon, lat]):");
+console.log("  L.marker([" + lon + ", " + lat + "])");
+console.log("  This would plot at: -68.625°S, 18.0365°E (Indian Ocean!)");