Sid "Scroll" Mayeux has over 25 years of experience in aviation training, safety, and risk management in the military, civilian, airline, and general aviation sectors. He currently trains Boeing 777 pilots, and he built and is flying a Van's RV-7A.
Whether portable handheld or panel-mounted, GPSes are the wave of the future in avionics, and these units can store and display a remarkable amount of detailed information. With nifty docks, handhelds can perform much like the panel-mounts in the cockpit, yet be removed for use in other vehicles.