In the days of tablet computers and smart phones, it is trendy to rely on the latest technology. There is nothing wrong with that, however, it is still important to maintain a backup plan. For example, any device that relies on cell phone tower will be virtually useless in the back country. There are methods with image caching, that you can utilize these types of devices when the cell signal is unavailable, which is great. But if you plan for the eventuality that at some point that device will fail, or the batteries die, you will be significantly better off.
The best backup plan is a quality map of the area you are going to be in. Part of any good trip into a new area involvces planning, what better way to plan a trip, is to lookup the area and learn more about it. There are a variety of websites which offer topomaps, such as mytopo.com not to mention that you can order high quality Topograph maps online. Maps such as these offer a valuable look into the area, and provide a level of detail not found on most tablets or GPS units.
It is always a good idea to carry a compass. A compass makes it easier to use the maps you have, or with general familiarity of the area area valuable tool to get unlost. Should you be willing to drop $400 on an iPhone or the latest tablet, spend another $4 and have a backup, which is probably more useful.