Certainly this is possible with a raspberry pi and a handheld radio. At my last company I had a friend and coworker who used a pi to communicate with his Andro

Certainly this is possible with a raspberry pi and a handheld radio. At my last company I had a friend and coworker who used a pi to communicate with his Android phone for GPS data to then broadcast APRS packets to track his morning bikeride in to the office. Not exactly handheld but there is room for miniaturization.