I think I might be missing something in the end game. I take it that as the puzzle can be completed by anybody anywhere at any time from now onwards “my own location” must be pretty large scale and not dependent on the time of year.
I have chosen one of the many cells with a suitable letter which is nicely placed and seems to be “labelled” by neighbouring cells.
However most images of the theme on line show this location accupied by a bigger, less hospitable location that would be represented by a different letter.
Have I missed something?