Updating Your Charts Using the Garmin Express 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.
Downloading the chart update may take up to a few hours.
You should use a blank memory card for chart updates. The update process erases the content on the card and reformats the card.
Parent Topic: Garmin Express App
1 As of software version 34.00, you can connect an external USB card reader to a
GPSMAP 7x3, 9x3, and 12x3 series chartplotter and use a memory card up to a 1 TB, formatted to exFAT with speed class 10 or higher.