Apparently, at least a portion of Russia’s fleet of Su-24 Fencers are running on handheld Garmin-like GPS systems in addition to their aging inertial navigation systems, as seen in this photo tweet showing a Fencer refueling from an Il-76 Midas tanker.
Setups like these were not totally uncommon in the late 1990s in some US combat aircraft that still had not received an embedded GPS/INS upgrade, but seeing this in 2015 is a bit startling. They even have what looks like a homemade plastic cradle made for the unit replete with rubber band “hold-back system!”