Yes, the geocaching icons will show on the Nuvi's. You don't need GSAK for that. MapSource, EasyGPS and other software will forward the icons. I have a Nuvi 750 and have used a 660 and the Street Pilots; all show the icons and can be set up to view in aerial format, which is my preference. The Nuvi's also accept POIs and with GSAK 7.0+, you can transform the higher Nuvi line into a PDA.
Hey Chuy!
If I understand your post, one can load a POI or multiple to a NUVI using easyGPS. Is it possible once loaded to call up a specific POI (cache) and then use the NUVI to get to the cache or close enough to pull out my 60CSx? I would rather buy a new GPS for the car than just upgrade the mapping software.
Thanks, fryguy42