Upgrade GPS-NAV LCD Navigation Display to 303 Navigational Display
No Longer Available 
Includes a firmware chip (installed by Cumulus Soaring, Inc.) and a cable to go from the 303 to a 302 or 302A. You will need to send the GPS-NAV LCD Navigation display to me for the upgrade.  It cannot be done in the field.

Note: After the upgrade the unit can no longer be used with a GPS-NAV.