The Garmin Catalyst device has two memory card slots. One under the back panel and one on the side.

The memory card under the back panel is included with the device and is used for recording videos and reviewing drive sessions
- To replace the memory card under the back panel, see Replacing the Memory Card
The auxiliary memory card slot on the side of the device can be used to add more storage space or to review a previously recorded drive session from your device that was recorded on a different microSD card
- The memory card in the side slot will be used for recording while it is inserted
Both microSD card slots require a 32 to 256 GB card, class 10 or higher