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SUVs Toyota Highlander Toyota Highlander Maintenance and Repair
4696 messages, Last post on Dec 02, 2009 at 11:52 AM
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During my flying time, ~1957 to 1995, I think I relied mostly (solely??)on VOR, variable Omni-range, and/or TACAN. I don't remember EVER trusting the magnetic compass except for secondary reference. What airplane do/did you fly, or how do you fly it such that you have need to rely on magnetic directional information? I suppose VFR on top....?? |
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| I am interested in this, discussion about Nav system. 04 HL LTD with Nav. I am questioning the input about magnetic field errors. I was under the assumption that position data came from the radio sgnal from the GPS satellites.This triangulates your position. The DVD compares the position location and places you on its internal maps, all references from the system are based on these two sources of info.Why does magnetic field enter ito this? BTW, love the NAV, perfect?NO Darn good?YES | |
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I own a Cessna P210. Great airplane--fast, carrys a good load, and a great IFR platform. I have 2 VORs as well as a Loran and the GPS units I spoke of, one VOR which includes localizer and glideslope for ILS approaches (it's actually an HSI). Both are coupled to an autopilot. VOR's have very little to do with magnetic compasses. All they are is fixed ground based navaid transmitters which provide directional bearings and DME info (distance measuring equipment--my DME unit is a King KN64). Tacan is the military version of a VOR. GPS is a satellite based navaid, and GPS receiver databases are preprogrammed based on maps and charts at a given time. As you no doubt know from your ground school curriculum, VFR charts are only valid for a three month period, and IFR charts for a 28 day period. the biggest reason for this is magnetic deviation--magnetic North is not stationary. I still use VORs, but GPS units approved for IFR are much quicker and easier-- they do all the calculating and triangulation for you. GPS units have only become approved for IFR use in the past few years. And yes, a GPS satellite will give you your position relative to the ground, but if the reference points pre programmed in your GPS receiver have moved (magnetic deviation), your position will be off with respect to the pre programmed map or chart your GPS receiver contains.
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Replying to: pilot130 (Nov 29, 2004 2:12 pm) I am going to check and see how much the position would be off at my lat/long from the DVD date interesting ! |
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Bingo!! Not quite that simple, but close enough for government work!! |
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The magnetic deviation issue only pertains to flying. It was used only as a reference with regards to the Lexus Nav. My two main problems with the Lexus Nav have to do with, 1, calculating the shortest distance to a point vs the shortest time. If I let it, it would send me up to 100 miles out of my way between two points. Luckily I discovered the flaw early on because the route it calculated as the shortest time I knew with definity that it was not. If you use this feature you should always crosscheck. The other most common problem is that if it loses the satelite(s) even briefly then once the satelite is recovered it completely "resets" its immediate past memory. So you can be traveling along under nav guidance on a highway adjacent to I5 and then have the system "reset" and start giving you new directions because it now "thinks" you are on I5. In other random instances I have had it direct me to the wrong place for a specific address. Most of the time when I realize the error I simply re-enter the destination address, it recalculates correctly and all is well. But several times, a definite minority, I have had it fail to calculate the correct location 2 and 3 times in a row. The strange thing is that the wrong location it takes me to is almost always only a few blocks from the correct location. Generally, as insurance, I try to do a mapquest printout before setting out to an unknown location. Strange, the last plane we owned was a C-210. Your P210 didn't happen to come out of Portland OR previous ownership, did it?
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Replying to: pilot130 (Nov 29, 2004 2:12 pm) I am going to check and see how much the position would be off at my lat/long from the DVD date interesting ! |
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| Mine is a P-210, as in pressurized, and I bought it new, imported it into Canada many years ago. | |
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Replying to: wwest (Nov 29, 2004 4:05 pm) |
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Replying to: pilot130 (Nov 29, 2004 2:12 pm) I am going to check and see how much the position would be off at my lat/long from the DVD date interesting ! |
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