You can use optional memory cards with the chartplotter. Map cards allow you to view high-resolution satellite imagery and aerial reference photos of ports, harbors, marinas, and other points of interest. You can use blank memory cards to record Garmin Quickdraw™ Contours mapping, record sonar (with a compatible transducer), transfer data such as waypoints and routes to another compatible chartplotter or a computer, and use the ActiveCaptain^® app.

The internal card readers on GPSMAP^® 7x3, 9x3, and 12x3 series chartplotters support up to 32 GB memory cards, formatted to FAT32 with speed class 4 or higher¹. Use of an 8 GB or larger memory card with speed class 10 is recommended. As of software version 34.00, GPSMAP 16x3 series chartplotters support up to a 1 TB memory card, formatted to exFAT with speed class 10 or higher.