IPA: /ˈmæpˌmeɪkər/
KK: /mæpˌmeɪkər/
A person who creates maps, often for navigation or geographical purposes.
The mapmaker spent years studying the terrain to create an accurate map of the region.
Mapmaker → It is formed from "map" (from Old French *mappe*, meaning a representation of an area) and "maker" (from Old English *macian*, meaning to make or create). A mapmaker is someone who creates representations of geographical areas.
Think of someone who 'creates' ('maker') a 'representation of an area' ('map') — that's what a mapmaker does.