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I don't know if my GPS will hold all of the geocache waypoints I just created pocket queries for but there are about 12,000 Geocaches within 50 miles of my house that I am downloading. I have a long way to go to catch up.
I have a micro sd card in mine but have not figured out how to access it through the GPSr yet.
You don't really access it from the unit. The unit merges data it finds on the internal memory and the SD card memory. But you may have to create specific folders on the SD card. For example, if you want to upload your geocaches to the SD card, you have to create the folder on the SD card. Here again is where the Garmin manual is useless, and you have to get the info from the Wiki page.
When you plug your unit into your PC, you will see two drives created on your PC. One is the unit internal memory, and one is the SD card memory.
At the Geocaching.com web site, if you click on the Send to GPS button, you will be able to select the GPS internal memory (the default choice) or click the drop down arrow and select the SD card drive. Of course this assumes that you have an SD card installed, and that you have the Garmin Communicator driver installed.
I was disappointed that I could never get EasyGPS to work properly with the 550. It is a neat program, and free, but does not handle geocaches properly.
I'm sorry this has turned into a Garmin 550 thread. But I'm trying to be helpful.
I have been out caching and having fun sorry i havent checked in lately. Made it to 700!! yeah.. and have had the ol Big Blue Beast in places it wasnt designed for. But Who cares. It dont have to know its not a desert runnin rock crawler.