Using GPS

The app connect to a GPS (and NMEA data stream) using Serial, Bluetooth or WiFi.

Your location is shown as a red circle with cross-hairs on the map. The center of the circle flashes to indicate when the position is updated, usually every second or two if there is good GPS reception. If the circle turns grey, GPS reception has been lost. The estimated accuracy of the GPS position is displayed on the Live Data panel.

The GPS Lock button scrolls the map to show the position at the center of the screen, and enables moving-map mode. As you move the position is locked and the map scrolls automatically to keep the position in the same place on the screen. You can drag the map to re-locate the GPS position to one side, (for example, to show more of the map ahead of you). As long as you don't drag the GPS position off the screen, it will remain locked at that screen location. If you move off the edge of a map, another map is automatically loaded.

If you are moving, you may also see a Velocity Vector. This is an arrow that shows your direction and speed of travel. The length of the vector is scaled to show where you will be if you maintain the same speed and heading for 5 minutes. You can change the time scale of the velocity vector under the GPS Settings.