GPS tracking
Ive used the Garmin GPS 65St., worked great for years, but you have to download aerial maps on computer at home beforehand. Worked great years ago, with todays tech I now use the Delorme InReach Satellite SOS/Communicator. You can buy the mapping/nav add on for $30/year, and download maps instantly on the mountain for the area your in. Plus you can text home, share your position, let others follow you in real time for the day etc, and when things go real bad press the SOS button and the Cavalry comes to get you. You do all this through satellite so no need for cell service. Best GPS/Communications/SOS device all in on I have ever used!