Thread: Maximum card size gpsmap 400 series

Originally Posted by softstuff

Hello,

I'm wrestling with my Garmin gpsmap 421s, marine gps unit.
Does anybody know what the maximum size memorycard is for this unit?
I tryed 4Gb that worked but before buying say 16Gb i would like to know if this is possible..
Looked in the booklet but cant find it there.

Bye SoFTSTuff

looks like "at least 8gig" (visit the link). Sometimes Garmin advertizes the "Max size they have tested" and it may work with a 16. Perhaps a 421 owner will respond with info on a 16gig.

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