It seems there is a table of a lot of Garmin codepoints, and I wonder if havinga test file that has a POI with each possible codepoint, and similarly for roads, would help determine the behavior/meanings for the rest of them. Perhaps things are 100% figured out, but it feels like not.
The basic idea is to take a lat/lon to start (to make the map 'near' someone working on this) and then to have a grid of points spaced 50m, roughly square, that has each possible codepoint in some range known to exist. Then a second grid with a N-S road and then every 50m E-W roads of every type on the left and on the right some normal road with every access combination. They could be be labeled with names that have the codepoint, and eventually the meaning, drawing from the database of meaning/codepoint mappings. Once this was written other people could more easily experiment to add knowledge.
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