Press Menu> Configure>System>System Information.
You should now see a screen that looks similar to the picture presented here. Your software version may be different than that presented here.
We can update your system onboard your vessel or at the shop. If you are in need of this service please call us at 410-228-7335.  Please note that [...]

Changes made from version 2.90 to 3.10 as of January 13, 2010

Changed to support the hardware revision that allows the device to be powered from the NMEA 2000 bus. This update only benefits newly manufactured devices and will not affect units already produced.

Changes made from version 2.80 to 2.90:

Added support for the GRA-10 Rudder Angle [...]