Cartography Sources

Glim
Educating Lyme in Master Classes in Etiquette provides between 103 to 112 Glim per action, plus a final action of 700. Alternatively, gain them through the first heist. Robbing Rubbery Glim shipments in Spite nets around 100 per action.

Map Scrap
Convert from glim. 'A message long cold' choice from Corpsecage Island provides 10 Map Scraps with 13 Cryptic Clues.

Zee-Ztory
Convert from Map Scrap or from Memory of Light. Ironically, The Broad Unterzee only gives out small amount.

Partial Map
Convert from Map Scrap.

Puzzling Map
Convert from Partial Map or by selling Right-Half Screaming maps to certain parties at your lodgings. New excavation options from The Forgotten Quarter may provide this, too.