Lock/unlock chart editing.
Generate link for sharing.
Reset all waypoints.
Undo last waypoint.
Distance units: meters, kilometers, miles or nautical miles.
Format latitude,longitude as either decimal degrees (d.d), degrees and decimal minutes (d°m.m') or degrees, minutes, seconds (d°m's").
Bearing type: true or magnetic.
(Required for magnetic bearings) Also known as magnetic declination, this is the difference between magnetic north and true north; positive when magnetic north is east of true north, negative when west. Click to look up the magnetic variation based on the 1st waypoint.
(Optional) Calculate bearings relative to this reference, either a numerical direction between 0 and 360 or a direction symbol, e.g., NE, SSW, etc. The compass rose points to this direction. Set this to the wind direction, to compute bearings relative to the wind; P means port, S means starboard. Note that the arrow should point to where the wind is coming from, like a weather vane.
(Optional) Minimum and maximum desired Angle of Attack (AoA), relative to the reference bearing. A red warning sign
is displayed besides any course which exceeds either one of these parameters. Note that leeway is not taken account. On a port tack your heading is increased by your leeway, and on a starboard tack it is decreased.
(Optional) Calculate travel times based on this speed. Click on any point on the route, or the end point, to measure the Time To Waypoint (TTW).
(Optional) Start time in 24-hour hh:mm format. Used in conjuntion with speed to calculate Estimated Time of Arrival (ETA) for each waypoint.
Display waypoints compactly.
Display geodesic (great circle) routes.
Enter one or more waypoints.
Disclaimer: This tool is provided free of charge "as is" without any warranty or guarantee and should NOT be used as a replacement for a nautical chart.