Dual Positioning
Pilots using the AIS as a positioning device (via the Pilot
Plug) may also connect a GPS as a backup positioning device.
If both the AIS and GPS are connected at the same time and both are sending valid
position fixes, then NavCruiser PRO will display two ships, one at each position
fix. The primary positioning device is used to determine navigation information
such as SOG, COG, ETA, TTG, etc. The primary positioning device can be changed
in the menu under "Tools->Primary Positioning Device". In the event that the primary
positioning device stops sending position fixes, the secondary positioning device
takes over.