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#81
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Cub Driver ) wrote:
I am a certificated American pilot, and have been for six years. I have never flown a VOR course and never expect to. I fly in New Hampshire, Maine, and Massachusetts. I have about 350 hours. Is this VFR or IFR? I mainly file and fly IFR in the Northeast US and I have learned that if I am flying to or from Boston or anywhere near NYC, I must file and at least start flying airways. The controllers will offer direct where possible, but the volume of traffic during the peak hours often prevents this. In my experience, there have been a few times where the only way I could get off the airways was to cancel IFR, weather depending. -- Peter |
#82
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Peter Duniho ) wrote:
: GPS increases the chances of collision, by reducing the average error. But : the issue did already exist with VOR navigation. Keep in mind that GPS : error is still going to be on the order 10 to 30 meters or so, just from the : position information standpoint, and then on top of that you still have the : problem of the airplane being kept exactly at the intended position (even : with an autopilot, there's going to be some slop, and not all pilots are : using autopilots in conjunction with their GPS navigation). The GPS error you have quoted is relative to a fixed point on the ground. Most modern cheap GPS recievers in the same region looking at the same sats with differential corrections are within meters of each other and with good processing can produce a relative position within a few inches. The way to deal with this is to simply move the GPS course .1 nmi to the right. This means if your doing a 90 degree turn over a VOR using a GPS, you should make your turn .14 nmi away from the VOR and you should be able to see it out the left window. At this point it won't matter much considering the GA autopilot slop but things could change in the future and now is a good time to start putting these things in place. but there are more an more aircraft flying in the skys that don't but things could change in the future and now is a good time to start putting these things in place. -tim http://web.abnormal.com |
#83
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Y'All,
To those of you who view this offset GPS program as the latest, I would like to add the following. At near the end of WWII when I was a 21-year old Corporal I was the operator/mechanic of a radar bombardment simulator/trainer as a part of the 58th Bomb Wing Training Center (B-29) on Tinian The device was called the Supersonic Trainer and made possible simulations of actual bombardment runs over Japan. In the week or so prior to the dropping of the bombs I was told to put the Nagasaki map into the Trainer. The trainer was running in conjunction with the APQ-23 radar system. This was the most advanced radar bombardment system of the war and was still the standard over five years later. Among its capabiities was to program offset bombing.. By dialing in the azmuth and distance of a target from a radar visible target such as a lake we could fly as though bombing the lake but hit the target. This is where all the offset navigation came from. Incidentally the Nagasaki bomb missed its aiming point by three miles. If you want the full story go to my web site at the very end of the IFR section. 7.9++ www.whittsflying.com Gene Whitt |
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