GPS ToolKit.NET works with any GPS unit that supports NMEA 0183 or Garmin protocols. Usually the GPS is connected to a computer by a serial cable that is sold by the manufacturer or through a Bluetooth connection. Generally, Bluetooth connections require the use of virtual serial port software (usually provided with the unit) to work with GPS ToolKit.

If GPS ToolKit is having trouble reading the data from the GPS, make sure that the GPS unit is set to the NMEA 0183 or Garmin protocol (this is usually an option on the unit's setup screen). Also, ensure that the correct COM port and baud rate is specified if not using GPS ToolKit's AutoDetectGPS functionality.

NOTE: Some GPS ToolKit features are dependent on the protocol in use by the GPS. Generally, current (active) route and satellite information is only available with the NMEA 0183 protocol, while the transferring of waypoints, routes, and tracks is supported only when using the Garmin protocol. Other information, including current position, speed, and direction data is available regardless of the protocol selected. If a particular GPS ToolKit.NET property, method, or event does not support a protocol, it is noted in the reference documention for that property, method, or event.