Hello,
Interesting, you've been a member for over 10 years.
R3 dates back a long time, it refers to Release 3. It is an official classification for map formats and data structures introduced for iGO 8.3 and newer versions (Amigo, Primo, NextGen ...).
I don't know what you mean by "standard" here maps. This is the iGO section, of course the maps are intended for the iGO software. They are compatible with all editions of the program except Luna version.
HERE are just one of the map publishers



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