jfwharton Posted July 16, 2022 Report Share Posted July 16, 2022 This may be how this aircraft was designed but I noticed that the DIST readout on the HSI only works when a VOR or ILS frequency is dialed in and shows the distance to the VOR or ILS when in VLOC or GPS mode. It does not show the distance to the next flight plan waypoint when in GPS mode. Personally, I would prefer it to show the distance to the next waypoint based on GPS mode. Distance to next waypoint when set to GPS and distance to VOR, ILS when in VLOC. Quote Link to comment Share on other sites More sharing options...
tkyler Posted July 16, 2022 Report Share Posted July 16, 2022 (edited) the HSI LED display uses "DME" for its distance readout. DME is a terrestrial, radio based transmitter, generally co-located with VORs (but not always) and ILS transmitting systems and hence why you'll only see distance when tuned into those transmitter frequencies. DME is not part of the GPS system at all and so will not display on the HSI. This is simply a classic case of putting a GPS in a 40+ year old panel Edited July 16, 2022 by tkyler Quote Link to comment Share on other sites More sharing options...
jfwharton Posted July 16, 2022 Author Report Share Posted July 16, 2022 OK, thank you. I figured that was how it was. Quote Link to comment Share on other sites More sharing options...
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