Friends are looking into radio transmitting dog collars. When out hunting hounds can really go and forget about their position in this life, property of us humans. When they are on the sent nothing else matters. These things cost about $1500 for a receiver and two collars. Battery life and moisture sensitivity are also issues. It is interesting that some collars will transmit whether the dog is moving, barking or has something up a tree.
GPS systems are also available but require the use of a GSM cell phone to interrogate the GPS unit and a clear view of the sky so 4 satellites are always in view. My personal experience with GPS in the forest is that the signal is often lost due to trees and gullies. Also, the less expensive ones just give a position by latitude and longitude that have to be translated into a position by some other means. Software programs exist to do this but one would have to go running thought the woods carrying a laptop. There are some systems that will call your GSM phone when the dog go outside of set boundaries such as out of your yard. It seems to me that there is an application here for tracking teenagers.
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