That is pretty cool Popej.
Just to be sure I understand, if my FID is 12345, then
12345 x 2048 = 25282560
25282560 + 6316032 = 31598592
So my map tiles would be numbered
I have a logical order of tile numbers that I have always used and wouldn't really want to change that 3-digit sequence. I would currently number the tiles like:
But using Garmin's standard, as long as I didn't have more than 640 tiles I could number them like this, since it falls inside the 2048 "block"
But none of this helps if somebody else has also chosen a FID of 12345.