Garmin® Marine Chartplotter not Recognizing an Inserted SD Card

If a chartplotter does not recognize a micro/SD card when inserted, there are a few reasons.

Check the size of the SD card

Some Garmin® Marine chartplotters can utilize up to a 1TB SDHC card, refer to the information below to see which devices can use what card size.  

Marine micro/SD Card Requirements

Garmin Marine Device Software Updates

New exFAT support on Garmin Marine Devices

Legacy chartplotter with the software out of date can only read up to a 2GB SD card and must first be updated to read larger SD cards.  Update the software with a 2GB SD card and the chartplotter will then be capable of reading up to a 32GB SD card.

Try a different SD card or an Adapter

If the card does not exceed 1TB card, then it is possible that the SD card is damaged or, if using a micro/SD card, the adapter has failed. Try a new SD card or a new adapter. 

If trying a new SD card or a new adapter does not resolve the issue the device may need to have the card reader repaired.