We don't recommend you do it, however, because you might end up placing a direct-to line on your map, leading to confusion about which course you're following to the runway. This appears when in the approach phase and when either FINAL is armed or engaged or a non ILS approach has been entered. If you want GPS DME to match traditional DME on an ILS approach, you could type in "Direct IXXX" to get distances that match your approach chart. Examples of non-radar approaches include ILS, VOR, TAC, NDB, RNAV/GPS and MLS. Comprehensive documentation for FlyByWire Simulations. If you're flying IFR with an approved GPS, you can use GPS distance to substitute for DME.įor instance, if you're flying on an ILS and the DME for the FAF is 5 miles from the LOC antenna, and you're 2 miles away from the fix, your GPS DME will give you a 2 mile distance to the FAF. Emission patterns of the localizer and glide slope signals Glide slope station for runway 09R at Hannover Airport in Germany. The ILS has a glide slope providing vertical guidance. Thanks to GPS, pilots are using traditional DME less and less. The ILS localizer is more sensitive than a VOR radial, therefore providing more accurate lateral guidance. If the equipment is overloaded by too many aircraft, those farthest away may not be able to pick up DME signals at all. These are also called 'reference' and 'variable' phases. The VOR sends out one stationary master signal, and one rotating variable signal. Ground-based DME transmitters are also rated to handle roughly 100 aircraft at a time. The frequency range for a VHF Omni Directional Range Radio (VOR) is between 108.0 MHz and 117.95 MHz. The bolt pattern is interchangeable with the Comant CI-120 and Dayton Granger 15960. The system is suitable for employment in single and twin jets and rotor aircrafts. DME requires line-of-sight between the aircraft and the ground station, and terrain and distance beyond the horizon will prevent DME from working. The VOR/LOC/Glide slope antenna systems consists of a pair of blade antennas, a phasing coupler, and two 24 inch cables.
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