Sporty’s Pilot Shop recently announced an E6B computer application compatible with the Apple iPhone, iPod Touch and the large-screen iPad. The app costs $4.95 and is available at sportys.com.

The mechanical E6B is the more versatile descendant of the government issued G-1 True Airspeed flight computer from World War II. The G-1 was round, about 8 inches across and made from Bakelite ...