Today new on the forum but "Old" on the GPS.
You can use a 16 Gb Micro-card in the Dakota 20. It has to be SDHC. Class-nr just tells something about read/write speed. I always use Class 2. Use a small USB-Card-reader for sending maps (gmapsupp.img's). The USB-bus in the Dakota is very slow. For a Dakota you can rename these maps to: country.img. Don't forget to make a Garmin directory on it to place the maps in it.
If you merge maps together don't overwrite 4 Gig; Vectormaps do work, but very slow. Bitmaps have no limit. Best way to have a speed boot: put the renamed maps on the SD in a different directory and only the map you use in the Garmin directory. Connected to the/a computer you can always manage them from one dir to another. I always travel with2 SD's and a small USB-cable in the small GPS-bag(Countries N-Europe and countries S-Europe).
You can use a 16 Gb Micro-card in the Dakota 20. It has to be SDHC. Class-nr just tells something about read/write speed. I always use Class 2. Use a small USB-Card-reader for sending maps (gmapsupp.img's). The USB-bus in the Dakota is very slow. For a Dakota you can rename these maps to: country.img. Don't forget to make a Garmin directory on it to place the maps in it.
If you merge maps together don't overwrite 4 Gig; Vectormaps do work, but very slow. Bitmaps have no limit. Best way to have a speed boot: put the renamed maps on the SD in a different directory and only the map you use in the Garmin directory. Connected to the/a computer you can always manage them from one dir to another. I always travel with2 SD's and a small USB-cable in the small GPS-bag(Countries N-Europe and countries S-Europe).