***Meaning*** :: <u>G</u>enerator, <u>R</u>ate of Turn, <u>A</u>ttitude, <u>B</u>all, <u>C</u>lock, <u>A</u>ltimeter (sensitive), <u>R</u>adio, <u>D</u>G, <u>D</u>ME (above FL240) ***Source***: [[8 Acronyms Every Instrument Pilot Should Know]] ***Related To***: [[FAR 91.205 Instrument and Equipment Requirements]] #acronym