It is indeed a very good buy. The Geko is also on sale for under 100$. As a survival tool, I consider the GPS as I do a compass. You need a paper map 1st, compass second, GPS third.

In order: learn to read a map, learn to use coordinates, bearings, learn to use the compass, then learn to use the GPS uploading coordinates form the map, making routes. That way if the GPS craps out, you pull out your compass and keep walking!

You don't need all the bells and whistles in your first unit. Once you are thoroughly familiar with the use of your GPS, you can shop for your dream machine…