Here's what I got from the Garmin Support page:
 
"QuestionWhat is the largest size microSD card that I can use in my X-series GPS unit?
Answer:

At this time, the 2 GB cards are the largest microSD cards that can be used for the X-series GPS units. However, the X-series GPS units are not compatible with the San Disk Ultra II cards and therefore we do not recommend using the Ultra II micro SD cards with any of the X units.

Last modified on06/01/2007"
----- Original Message -----
From: Richard Daines
To: listserv@azgeocaching.com
Sent: Monday, September 10, 2007 11:43 AM
Subject: Re: [Az-Geocaching] Question

I ran across a web site today that claims SD memory is limited to 1 Gb, which explain why my 2 Gb didn't work.  As with all Internet info, take with a grain of salt unless Garmin verifies.

On 9/9/07, Richard Daines <rjdaines@gmail.com> wrote:
I couldn't find the answer in the manual but I have a 2 gig in mine.  I was, however, not sucessful in using 1.8 gigs worth of topo maps with the GPS.

On 9/9/07, RichieFein@aol.com < RichieFein@aol.com> wrote:
Does anyone know what the largest capacity memory card will fit in a Garmin 60CSx unit? Thanks.    Richie     aka Notso


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