It would be its own profession, and a rare one at best.
True dat. Some used the Bible as their primary source material. So helpful.
In Europe, the "science" (and I use that word loosely) of cartography was in its infancy, and that may be generous. So anything like what we understand to be "a map of the land" would be anachronistic, so you're already in uncharted territory. At best, you could assume Player Characters understand "maps" as the Romans did - period mapmaking had lost a lot since then. But even then, they were often more a matter of guesswork and arbitrary cobbling together of smaller maps and verbal descriptions than anything like "surveying" for accuracy. Many "coastal" maps were simply more or less straight lines with landmarks on them. A map of the British Isles concentrates on the coast, and while the inland is recognizable, at the same time it's laughably so.
(Some scarce Arabic maps and mapmakers and their techniques, were much better, but usually limited to the Levant, the Med, Arabian Ocean and African coast. They had (re-)discovered a coordinate system (Ptolemy?), but were still figuring it all out. But many of these were secret, and, of course in Arabic. )
Be sure you look at period maps, esp "T-O maps" and such. NOT as useful as anything today, nor even remotely close.
en.wikipedia.org/wiki/T_and_O_map
en.wikipedia.org/wiki/Tabula_Rogeriana
Ptolemaic (Roman) maps
Note - those links and images rang a distant bell: See also: Medieval Maps - reliable for navigation while flying? - this thread has more complete examples and full comments.)