The 3600 was actually what I originally intended to get. But when I did a search, I found the M5, more powerful, but at Amazon the same price.
I had borrowed a Garmin 76 series GPS before, and just got somewhat familiar with the cumbersome menus and maneuvering around them, and the terminology. I guess it takes some practice to work this one. While driving, it shows speed and direction, but not coordinates.
My first attempt at geocaching was not a very succesful one, since I couldn't find the correct coordinates. I had already looked at the photos, so knew where it was. I picked this site since it was only a mile or so away. But because of it being "downtown" not so good to practice a search. The rain was a welcome disruption. I'll try again next week, after I download that software.
I am finding also, there is not a lot of room for maps. I guess upgrading memory is not a waste (once I find out where it goes).
Thanks for the link.