Lanefan
Victoria Rules
Situationally dependent.Another question comes up on your becoming lost topic:
Is the DM obligated to correct the players if they have mapped wrongly, because they did not pay attention, and become lost even though they had a map?
If it's due to DM error in description then of course the DM should correct it.
If it's due to player error that the PCs in the fiction likely would not have made then the DM is free to correct it.
If it's due to player error that the PCs in the fiction could easily also have made then the DM should let it ride.