I have had mine for 10+ years. It is an Eagle brand, lat4er bought out by Lowrance. Any of the Garman,or Lowrance models will work fine. Some have downloadable software that includes maps of exatly where you are. When I finally bust down and get a new one, I'll choose a model that can download maps. I mainly use my GPS to mark the location of my truck, or camp and then use dead reckoning to hunt. That way I can concentrate ion my hunting and not on navigation. If this is what you're planing to use it for, then I'd suggest the small Garman models that you can pick up for $99. They're very compact and accurate. remember that GPS is a line of sight navigation system and if you are in thick forest, or in a deep canyon, you may not get a signal. This usually is not a big deal. Simply climb to a high point,or get to a clearing and it works just fine, get your bearings and shut it off and hunt back to your destination.
hope this helps.