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I think some people have some tiles due to GPS jitter
I've got some squares like that. Some I can't work out which activity they were as they don't show a green line in Squadrats. Probably a random GPS single point while I was swimming sometime. I'll need to get the surrounding squares though and I don't think they are impossible.
One square which is a bit dubious is by Temple pier. I was going to revisit and get the floating bar to be sure but apparently that sunk which is inconvenient.
I'd love to see stats on some of the least visited tiles in a certain area. I think some people have some tiles due to GPS jitter - not that I really care about others, I've tried to make private any activities I've found that have excessive jitter.