You would need to use two simultaneous coordinate systems. It could be long lat p and long lat with an offset. If the offset version does not change as many dig

You would need to use two simultaneous coordinate systems. It could be long lat p and long lat with an offset. If the offset version does not change as many digits as the standard then use that one. station curious and so much for machines, where the calculation is cheap. But it's for when you are trying to figure out if someone is next to you on a map or not. All of the coordinate systems that are grid-based including UTM have this problem.