I know Bulrush has one of these and now I do. I got a great deal on one off Craigslist. It is pretty big and heavy compared to the other Garmins, but I figure I can learn to use it then get something different later on.

Bulrush, or anyone else with one of these, anything I need to know that isn't in the book?
What is the big 4 pin plug for? It looks like it may be for the power adapter I saw on the Garmin website.

What battery setting do I use for Lithium batteries, "Alkaline" or "NiMH" (which I think is the setting for rechargables)?
Don't get me started, you know how I get.