There's some attempts done earlier to build tools that reduce the number of map tiles in a Garmin mapset. One of the best is done by rwsmith123. The drawback is that the map will be put in "Family" instead of "Product" inside the Windows registry. That makes TYP settings useless.
I've not seen any pre-build TOPO U.S. 2008 with reduced number of map tiles.
No recreational map of US for Oregon 4xxT/5xxT uploaded to public forums, just the map for 400i.
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