VFOM - What does VFOM stand for? The Free Dictionary
References in periodicals archive
VFOM is the same as HFOM, but in the vertical plane.
AUX--GPS STATUS SATELLITE STATUS EPU 0.03NM HDOP 0.7 HFOM 16FT VFOM 23FT AUX--GPS STATUS SATELLITE STATUS EPU 0.05NM HDOP 1.4 HFOM 33FT VFOM 46FT ABOVE: Your navigator knows GPS accuracy.