The past is standalone GPS units. The future is smartphones with GPS apps like Trimble Outdoors Navigator, says Outside Magazine.
"Big mountain skier Chris Davenport used the (Trimble Outdoors) Navigator app to find his way and record his progress on a bid to ski all of Colorado’s 13,000-foot peaks. Navigator is integrated with MyTopo, a custom-mapmaking company, so users can upload topographic maps to their devices with an SD card without needing a signal."
Read more about how new tech is making other gear endangered at: http://www.outsideonline.com/outdoor-gear/gear-shed/tech-talk/The-Endangered-Gear-List.html