I went with a Dell 9" Mini Laptop running Microsoft Streets and Trips 2009, why? screen size, and, the software has day/night mode. It too has has differant modes. Will generate a dot trail where you've been so you can go back. It has most (but not all) off road trails built in. It will track you even if no trail is noted, like I said it will produce a dot trail to return with.
I really like the screen size.....you can see it. It's nice to have 9" screen vesus a 1-2" size. It has many other functions like most hand helds do. Over 11 million points of interests. It also calculates speed, distance traveled, direction....everything.
And you can go to the Streets and Trips web site and use a free version to test. Costco sells it if I remember correctly under $75.00. I got mine off ebay $33.00 which include the GPS antenna and all cables you'd ever want.
Good luck and HAPPY TRAILS