I have a Garmin Nuvi-Cam which is great since it records my daily drive, lifetime maps, etc. BUT does not have RV specific maps. I thought it would be cool if Garmin had an option for a software updat...
There's nothing special about the maps. The RV units have databases for clearance, sharp curves, etc, and the software that reads that information. Probably a beefier processor to handle the extra data.
My GPS gets moved throughout the day depending on glare from the sun... if it were trying to record out the windshield I think it would also see a lot of glare being far back from the windshield.