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https://support.garmin.com/faqSearch/en-GB/faq/content/U8uZN9B2OM0AImFS8HFIxA
Maximum memory card size for outdoor mass storage devices
Many Garmin outdoor mass storage devices include an expandable memory slot. A memory card can be inserted into this slot and used to store the following:
- Additional mapping
- BirdsEye imagery
- Photos (on devices with camera)
- GPX files including geocaches, waypoints, routes and tracks
When selecting a memory card, be mindful of the device requirements:
- Card form factor (the shape of the card):
- microSD card - Most Garmin mass storage devices utilize this form factor
- SD Card - Colorado Series*
- Card Speed Class (the speed information can be read from or written to the card):
- Standard speed class - Most Garmin mass storage devices can use any card with a rating of Class 4 through Class 10
- Card Size (the amount of storage space on the card):
- 64 gigabytes (GB) - Monterra only (card must be formatted to FAT 32 when using with Monterra)
- 32 gigabytes (GB) - Most Garmin mass storage devices can use cards up to this size
- Smaller Cards - Devices will detected cards with as little as 64 megabytes (MB), but few maps will completely load to a card that is this small: Check mapping requirements prior to purchasing a microSD card
- Manufacturer (Brand of Card):
- While any brand of microSD card should work, Garmin has only tested more common brands such as SanDisk or Kingston.
In addition to the above memory card limitations, there may be other file limitations that apply to your device; for more information please see related content.
* A microSD card can be used with a SD card adapter
**The Colorado series and Oregon 200, 300, and 400 models only support microSD cards up to 4GB in size.
