LINE OF SIGHT GRAPH TAB HELP

Enter the frequency, latitude/longitude for Point 1 and
Point 2, and transmitter/receiver heights above each point.

Valid Input:
  Frequency: Any positive numeric value (MHz)
  Latitude: -90 to 90 degrees
  Longitude: -180 to 180 degrees
  Height: 0 m to 20,000 m (0 ft to 65,616 ft)
  Maximum distance between points: 500 km (310.69 mi)

Features:
  - Earth Curvature Adjustment (4/3 Effective Earth Radius)
  - First Fresnel Zone boundary display
  - Line-of-sight obstruction detection
  - Graph button plots elevation profile with LoS analysis
  - Select from saved points for each location

The graph displays:
  - Green: Terrain elevation profile
  - Black: Line of sight path
  - Red: First Fresnel zone boundaries
  - Blue dot: Point 1 (transmitter)
  - Dark red dot: Point 2 (receiver)

Uses the WGS-84 geodetic coordinate system.
