Hi all,
Just a bit of further feedback here. I followed some of the suggestions here and got it to work on a Nuvi 2200. Here's how:-
1.) Obtained the serial number of the SD-CARD by holding down the top right of the screen for 10s and going to page 3.
2.) Inserted the serial number (9 digits, I dunno why but it worked) in Jetmouse's Keygen and added 900 2 0 0 for MapID, PID, RgnID and VenID.
3.) Generated the Unlock Code and created the gmapsupp.unl file that was copied to %SD-CARD%\Garmin.
4.) Copied the %PC%\LEX_PKG folder to %SD-CARD%\Garmin and disconnected the device from the PC.
5.) Restarted the GPS and tested the GLG. All OK.
fugglefeet
P.S. %PC% and %SD-CARD% refer to the relevant locations of where the information is stored and copied to.