i think i found a solution. haven’t had the time yet to test it more extensively, but it looks promising.
i noticed that the oregon accepts custom icon for certain pois (i tested 0x34…, 0x51…, 0x115… so far). now i made two maps of the same area, on top of each other.
1st map, lower draw priority, no typ file: contains all the pois for the “where to” function of the gps (ie. 0x2b01 for hotels). this is where the unit puts all the standard icons, but you don’t see them, because the 2nd map is on top of them.
2nd map, higher draw priority, my custom typ file: contains only pois where the unit accepts custom icons. this is the layer you see on the screen.
result: “where to” still works. the standard icons don’t show on the map, except when you choose a poi from the bottom map as navigation target.
i’ll do some more tests in the next few days.
