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Point-to-point Navigation

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Point-to-point Navigation

Old 31st Jan 2007, 09:57
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Point-to-point Navigation

Hi, everybody
Id like to know if anyone is familiar with this kind of navigation and how to use it trough the fly computer like Pooleys CRP1 or another one. Id like to know the basics like to find the headind given a 2 radials and 2 distances.
A website that teaches that kind of stuff wood be welcome.
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Old 31st Jan 2007, 10:20
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hi constelation...

not sure what you are asking.

if its how to plot between two points that just happens to be the intersection between two radials ( the dme is unimportant )...then its just the same as working out track, adjusting for variation, adjusting plus or minus for the wind correction and adding or subtracting the variation to get a compass course to fly...as if flying between two ground features or airports.if you want to go to a certain point ( in your example the intersection of two radials ...first you need to draw a line on a map from where you are to where you intend to go...then use the method i outline...but you need to start with a map and your computer...

the method of doing these things would be explained to you by your instructor...or you will get in in the booklet with your 5B or CRP 1.

you need to explain your problem a bit more...

perhaps i misunderstand.

the dean.
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Old 31st Jan 2007, 12:58
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The problem :

Im on radial 185 at 40 Dme inbound and i want to go to 232 radial at 20 Dme. forget the wind. Using only the CRP or flight computer i want to know what heading/ track shall i use to get there. The calculations are made in the wind face of the computer but i dont know the rest
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Old 31st Jan 2007, 13:10
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About 335+/- , see how it goes and adjust.

Edited @1425- Did that by estimate , just found the confuser in the back of the draw and worked out how to do it.

Using the square graph lines at one end of the slide mark 185/40 on the rotating bit, then mark 232/20. Align the 2 marks against a verticle line on the graph lines and your track (or reciprocal sp?) will show at the top of the computer.

Last edited by funflier44; 31st Jan 2007 at 13:26.
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Old 31st Jan 2007, 17:14
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Con's, OAT Media have a cd rom which teaches the CRP1
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Old 31st Jan 2007, 17:25
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thanks every body for the help. By now i can at least find the track given 2 radials and 2 distances.
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Old 1st Feb 2007, 10:34
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This is a military method and actually very accurate. It was taught to me by the Examiner who did my Instructor test.

You basically "visualise" your position on the DI. I can do it just not explain it very well!!!
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Old 1st Feb 2007, 12:30
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Use the face of the DI. Assume you're at 180/20 and want to go to 090/30.
Pick biggest distance (30), take radius of DI as 30 and the Navaid as the centre. Find current position as 2/3 of the DI radius in 180 direction (radius represents 30) and desired point as 090 on the circumference (radius represents 30), hold pen or other straight edge over the 2 points then move pen up to pass over the centre - wherever it's touching on the circumference is the magnetic track between the 2 points.
Turn on to track, use MaxDft to assess drift and then turn on to heading.

Sounds complex, it's actually very easy!

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Old 2nd Feb 2007, 07:23
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Thats the other way to do it. I find easier and somewhat more accurate to do it on the flight Computer. But initially the guy who explain to me in the first place told me that way, though i find it kind of "rough". The advantages of this method is to enable someone whos flying not to deviate the look from the instrument.
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Old 2nd Feb 2007, 15:38
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When I joined the RAF in the 60s we were shown how to do this, since then I I have never found any application where I needed to do it.
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Old 2nd Feb 2007, 15:47
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Ah, but you had all sorts of navigator's impedimenta, Whopity! Dangle-ometer, lodestone, octant.....crystal ball. No to mention dividers, parallel rule and plotting table!

Whereas we of the two wing master race just had to guesstimate it from the RMI.
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Old 6th Feb 2007, 00:20
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Now that you've got an estimated track it's wise to check it. When you turn onto the new heading (in nil wind) if your estimate is correct, then the line between your start point (180/20) and destination (090/30) will be vertical.
You can also use this method to check your progress. One way is to use the ADF card or the RMI to visualise your destination (090/30) compared to where you are along your new 'track required'. If you are not on this track, then the line between where you are and the destination (090/30) will not be vertical.
Make a correction in the natural sense to your heading to make that line vertical and you will be tracking towards your destination. If you are lucky enough to fly a biplane fitted with an RMI, like BEagle does, then with some practice this procedure is quite easy.
I was taught this years ago and have never used it except in flight tests. However, it makes an interesting cockpit conversation topic and I suppose if someone pulled the plug on the satellites you could save a few track miles. But then I'd be inclined to overfly the azimuth aid.

Last edited by pithblot; 6th Feb 2007 at 13:31. Reason: Clarify start point & destination
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