Hi LBR....using a tablet is the latest trend here in Central Oregon, and the Nav device of choice.....any of them with "location/GPS" will work......we are downloading an app like "Backcountry Navigator Pro (about $11) for Android systems, and "Scenic Maps" for ipads.....the most popular tablet being used is a Samsung Galaxy4 8-inch (about $169-189)....after downloading your nav app, no WiFi signal is needed on the trail (no data used) and the larger display screens and detailed maps are pretty good. Ram mounts are used and battery life is long, and the option of powering it up with a USB cord is popular also.....by using a TOPO app like BCNP and also downloading Forest Service MVUM's, and leaving both programs active on your tablet, you can navigate with a TOPO map and see which of the FS's service roads and trails are "open"......