GPS devices

APT is able talk with various GPS receiver devices sometime called "GPS dongles". All devices that can talk NMEA protocol and expose a COM port are supported. Various Android and iOS apps than export the smartphone's location as NMEA device via Bluetooth are supported. Also is possible to use the GPS readings from the  PrimaLuceLab EAGLE computer.
See the section Extra Devices for information how to configure the connection to a GPS dongle.
The coordinates from a GPS dongle is used by by the mount, for the Darkness Clock and DSD Calculator.