Does anyone have a process or method that helps with creating or checking for valid locations regarding MiB / SoS and treasure maps on custom maps?
 
There's already a number of checks that happen in TreasureMap.cs. Are you sure they won't work on the custom map as-is?

The random placement system allows for "bad" locations by changing the coordinates on unused maps every 30 days.

SOS.cs also appears to pick a random spot on the map and then check it for deep water status.
 
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