read ... thank you for pointing me in the right direction and shame on me for not finding
BUT
3 letters (JCV or G2S) are not enough for search engine
and 2 days for reading the whole Garmin forum is a little bit too short
I'm almost all set now with basic steps
as a summary to my questions:
- base map is NOT necessary, but it can be usefull
- as I run GarminXT on a mobile phone JCV & G2S are NOT compatible
am I right?
Laurent