I have the DeLorme Earthmate PN-20 and I love it.. It took me a little while to get used to it at first though. They have some great features. Up here in the miles upon miles of dirt roads and woods it comes in handy. It is also used by the State police and the Warden service as it is pretty acurate. You will find it hard to beat the TOPOs. As well as all the other features DeLorme has to offer that comes with these if you wish to buy any of the extra bundles.. Good Luck on what you decide.