Map markers are most useful when they preserve decisions. Mark places you intentionally leave so exploration remains flexible without becoming forgetful.
Mark unresolved locations
Use markers for places that look important but are not worth forcing yet.
Mark difficult encounters worth revisiting
A marker turns retreat into a planned return instead of a forgotten failure.
Mark useful travel relationships
Keep track of routes or junctions that connect areas you expect to revisit.
Remove markers once they stop being useful
A map full of obsolete markers becomes harder to read than no system at all.