Collection: C-Map 4D

C-MAP 4D chart cards are sold by individual coverage region, so the most important buying decision is matching the card to the waters you actually navigate. The lineup here covers the US West Coast from Southern California to Southeast Alaska, along with British Columbia, and extends further to remote Alaskan waters including Prince William Sound, Cook Inlet, Bristol Bay, and the Aleutians out to Attu Island. Hawaiian Islands coverage rounds out the collection. Each card is a distinct purchase, and some cruising areas fall within a single card while others may require overlapping regions if you plan longer passages across coverage boundaries.

Before purchasing, confirm that your chartplotter accepts C-MAP 4D format cards, as compatibility varies by plotter brand and model generation. C-MAP 4D cards deliver vector charts with detailed bathymetric data and enhanced coastal coverage, which is particularly valuable in the complex tidal inlets and archipelagos of the Pacific Northwest and Alaska. Boaters planning coastal passages should review each card's named coverage zone carefully against their intended route before buying.