avbug said:
The marvel is the technofreaks who don't believe it can be done, legally and safely, without dual FMS, flight director, and a Papal blessing.
Geez, what an intertaining thread!
Avbug: we must be dinosaurs from the same era. Only I didn't get a Papal blessing and now I'm feeling underappreciated.
When I was a military examiner, TACAN point to point nav was a standard part of the ride. On the 180 at 60 and want to go to the 090 at 30? Turn 045. Distance 90 nm. Simple. Don't have (or know what a TACAN is)? HSI/DME or OBS/DME works equally well.
Legal to accept? Absolutely.
These days I fly the TEB5 several times a month. Most guys bust the altitude restriction long before they get to the intersection. But you can bet your bippy that I've got the needles and DME up just in case the magic boxes don't do their thing.
Yes you could approximate your position based on an estimated GS, but you cannot acurately define this INTX.
True, but I never said I'd get a GPS accurate answer. Of course the accuracy is pretty dependant on how well I can determine my ground speed, and of course how well I time the CDI movement, but it seems to me that in most cases, I can get a position fix that's within 5-10%,
How wide is an airway, guys? 4 miles either side of the center line. You don't have to be within 200 feet of where the FMS thinks the intersection is to be accurately navigating in the NAS. Hypothetically, two of us could fly two separate airplanes to the same intersection at the same time and still be 8 miles apart.
My personal longest direct route flight? How about Honolulu to Maine? 12.7 hours March 15, 1980. Not many vectors available mid-Pacific. Not many VORs, either.
How did we ever do all those Lant/Pac crossings with only a wet compass and a coffee grinder loran A? Anyone know how to plot TDs?
Admittedly, punching "White" intersection into th FMS is simple and very accurate, but when the screen/computer/GPS fails and you're overwater, you might want to remember/learn some of the techniques that us old farts thought were just common every day procedure.
BTW, I flew this morning. IFR Cleared direct PNS - NEW. Report left base runway 18R. No SID, no STAR, no feeder fix. Happens all the time.
Fly safely out there guys!