This is from the 1e DMG.
"If movement is into an area where the party has not already been and mapped, then immediately roll again to determine if the party will be lost the next day also."
"Mapping During Flight: No mapping is ever possible. Give no distance measures in moving the pursued. Give no compass directions either!"
"While the construction is underway, the character should be exploring and mapping the terrain beyond the core area."
It seems the characters were the ones mapping in 1e.
Do you remember if any of the old modules where the players started locked up, enslaved, or otherwise de-equipped mentioned anything about not being able to map due to lack of supplies? (I don't have any of them, but it feels like one of them would have).
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