Agree 100% with your 2 statements regarding basemap. My purpose in posting the replacement method seems quite academic, and could even be perceived as like tilting at windmills i guess. It would have been known to advances users for some time anyway. It's quite about showing those less advanced [my peers] that Garmin's statement regarding non-replaceable basemaps is rubbish at worst and disinformation at best.

I am happy to attract interest from advanced uses like you who may like to help with my other [maybe considered quite pointless] 'hobby horse' projects such as identifying the unit region to which supp maps are flashed by Sendmap20 and MS/MI, and also using elements of other units fw such as Honda GoldWing Navi or SP27x0 to enable NT map use in SP26x0.

However, my real and immediate desire is obtaining a region USB dumper for these old units. Even in the units with a media card there are no commands in fw that i've found for rrgn etc, which was not surprising even to me of course.