D-GARY: German registration letters of the airplane;
in international phonetic alphabet Delta Gulf Alpha Romeo Yankee.
VFR: visual flight rules, i.e., flying in good
CAVU: ceiling and visibility unlimited.
ADF: automatic direction finder, or radio compass.
VHF: very high frequency radio.
OMNI: omnidirectional radio range system, operating on
VHF, now in extensive use for navigation.
HF: high frequency radio used primarily for long-range
RPM: revolutions per minute of an engine.
MANIFOLD PRESSURE: measured in inches of mercury, it
shows power output of an engine.