Honeywell GNS-XL - Manual (Page 263)

DEFINITION
TRANS LEVEL Transition Level (The Altitude at which Altitudes
Become Flight Levels)
TRCK Track (Satellite Status)
TRMNL Terminal
VAR Magnetic Variation
VERT DEV Vertical Deviation
VHF Very High Frequency
VLF Very Low Frequency
VNAV Vertical Navigation
VOR VHF Omnirange
VORTAC VHF Omnidirectional Range TACAN
VPU VORTAC Position Unit
Waypoint A Point Defined in Space Used in Navigation
WPT Waypoint
WW NDB Worldwide Coverage
XPDR Transponder
XTK Crosstrack
List of Abbreviations & Definitions
6-7 GNS-X L Flight Management System
Rev. 0
Oct/96