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What's stopping you flying a Garmin over on a drone?
a) It's not human powered
b) You haven't actually visited the square.There are far easier ways to cheat if you want. Just edit a GPX file to put some points in the square and then upload that.
A kayak along that part of the river would get a bunch of those tiles. Probably best to organise this with a group of people (for safety reasons) alongside someone that knows what they are doing.
I don't know what I'm looking at here. What is it?
What's stopping you flying a Garmin over on a drone?