The Edge 1000, Explore 1000, Edge 1030 and Edge 1030 Bontrager, have an expandable memory slot which a microSD card can be inserted. This card provides the ability to install additional detailed mapping for other areas not preloaded to the device.

Garmin recommends a class 4 to class 10 card no larger than 32 GB*.

Another limitation is the number of individual mapping segments a device can hold. Roughly 5250 map segments² can be transferred to the Edge. Many Edge devices are pre-loaded with Garmin Cycle Maps, a base map and a digital elevation model. (DEM). The preloaded maps consist of approximately 2300 mapping segments (Approximately 1000 for Europe). If you have purchased additional supplemental maps for your device that you need to load to a microSD card from a computer, it is important to note how many map segments you are selecting in order to not exceed a device's limit. The program that you use when selecting your additional maps should indicate the number of segments are have selected.

*NOTE: While any brand of microSD card should work, Garmin has only tested more common brands such as SanDisk and Kingston. The MicroSD card should be in the FAT32 format.