diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index 99ce9e2..49f2d34 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -1673,7 +1673,7 @@
   "losFrequencyLabel": "Frequency",
   "losFrequencyInfoTooltip": "View calculation details",
   "losFrequencyDialogTitle": "Radio horizon calculation",
-  "losFrequencyDialogDescription": "Starting from k={baselineK} at {baselineFreq} MHz, the calculation multiplies 0.15 × (frequency − {baselineFreq}) / {baselineFreq} to reach k approx {kFactor} for the current {frequencyMHz} MHz band, which defines the curved radio horizon cap.",
+  "losFrequencyDialogDescription": "Starting from k={baselineK} at {baselineFreq} MHz, the calculation adjusts the k-factor for the current {frequencyMHz} MHz band, which defines the curved radio horizon cap.",
   "@losFrequencyDialogDescription": {
     "description": "Explain how the calculation uses the baseline frequency and derived k-factor.",
     "placeholders": {
diff --git a/lib/l10n/app_localizations.dart b/lib/l10n/app_localizations.dart
index 1996ad6..5f0cd5e 100644
--- a/lib/l10n/app_localizations.dart
+++ b/lib/l10n/app_localizations.dart
@@ -5043,7 +5043,7 @@ abstract class AppLocalizations {
   /// Explain how the calculation uses the baseline frequency and derived k-factor.
   ///
   /// In en, this message translates to:
-  /// **'Starting from k={baselineK} at {baselineFreq} MHz, the calculation multiplies 0.15 × (frequency − {baselineFreq}) / {baselineFreq} to reach k approx {kFactor} for the current {frequencyMHz} MHz band, which defines the curved radio horizon cap.'**
+  /// **'Starting from k={baselineK} at {baselineFreq} MHz, the calculation adjusts the k-factor for the current {frequencyMHz} MHz band, which defines the curved radio horizon cap.'**
   String losFrequencyDialogDescription(
     double baselineK,
     double baselineFreq,
diff --git a/lib/l10n/app_localizations_en.dart b/lib/l10n/app_localizations_en.dart
index 5c7cf36..98fee85 100644
--- a/lib/l10n/app_localizations_en.dart
+++ b/lib/l10n/app_localizations_en.dart
@@ -2849,7 +2849,7 @@ class AppLocalizationsEn extends AppLocalizations {
     double frequencyMHz,
     double kFactor,
   ) {
-    return 'Starting from k=$baselineK at $baselineFreq MHz, the calculation multiplies 0.15 × (frequency − $baselineFreq) / $baselineFreq to reach k approx $kFactor for the current $frequencyMHz MHz band, which defines the curved radio horizon cap.';
+    return 'Starting from k=$baselineK at $baselineFreq MHz, the calculation adjusts the k-factor for the current $frequencyMHz MHz band, which defines the curved radio horizon cap.';
   }
 
   @override
diff --git a/lib/screens/line_of_sight_map_screen.dart b/lib/screens/line_of_sight_map_screen.dart
index c8b5a88..be164e3 100644
--- a/lib/screens/line_of_sight_map_screen.dart
+++ b/lib/screens/line_of_sight_map_screen.dart
@@ -1065,13 +1065,15 @@ class _LosProfilePainter extends CustomPainter {
       samples.last.terrainMeters,
     );
 
-    double distanceForCanvasX(double x) =>
-        ((x - horizontalPadding) / chartWidth) * maxDist;
+    double distanceForCanvasX(double x) {
+      final normalized = ((x - horizontalPadding) / chartWidth).clamp(0.0, 1.0);
+      return normalized * maxDist;
+    }
 
-    double elevationToPixel(double elevation) =>
-        size.height -
-        verticalPadding -
-        ((elevation - minY) / ySpan) * chartHeight;
+    double elevationToPixel(double elevation) {
+      final normalized = ((elevation - minY) / ySpan).clamp(0.0, 1.0);
+      return size.height - verticalPadding - normalized * chartHeight;
+    }
 
     double extrapolateTerrain(double distance, bool isLeft) {
       final samplesForSlope = isLeft