Hmm.
- "Squinter", "hired-eye", "crow chaser".
- "Sheet folder", "paper prophet", "tube stuffer" (re rolled maps in a carrying tube).
- "Calf-killer", "calf-skinner" (in a situation where maps are produced on vellum).
- "Compass-chaser", "lode lover" (ref. lodestones).
- "Sticks", "stringer", "stick farmer" (assuming areas are being pegged out with sticks and string).
That's mostly taking a low-tech fantasy angle, a sci-fi setting could involve more references to the specific technology employed in the setting.