Thread: Need some help with Nav?

Hi guys,

Can anybody give me a quick run through with Nav, like Step 1, 2 3?

I have a chart, protractor, scale ruler and CRP-1 etc. A friend showed me how to do it once (i.e working out True Heading, Magnetic, Adjust for Wind, etc).

I have Plog sheets as well to put everything in order.

Just wish to know whats in involved in plotting a course from A to B, for instance Wellesbourne to Gloucester. I know winds are on the day but just put in some suitable numbers.

So far I have...

1.) Draw a line from the dead centre of the departure aerodrome (EGBW), to the dead centre of the destination aerodrome (EGBJ).

2.) Measure distance in nm (~27.2nm)

3.) Using protractor on the centre of the departure aerodrome and take a reading (230deg) - this is my true heading?

4.)...

Cheers.

Hi Chris

"3.) Using protractor on the centre of the departure aerodrome and take a reading (230deg) - this is my true heading?"

This is your course or track. Your true heading is when you apply the wind correction angle to this using your whizzwheel, ie the heading you need to steer your plane to stay on your desired track. Then you've got magnetic variation (East least, West best) which gives you your magnetic heading. Does that make sense? One of the pros on here would probably explain it better!

Cheers Paul!

I can't remember how to work out the magnetic variation?

Magnetic variation is on the chart Chris, you will see dashed lines (isogonals I think they are called) running up the chart so just take it off that. Think Wellesbourne is around 2.5W or something.

Also dont measure your track from over the aerodrome, put the protractor in the middle of the line, lining it up with the grid lines and take the reading that way (place a ruler over the top if needs be). This will get you your true track, and then you simply add/take away the magnetic variation from it in order to get your magnetic track.

Also 27.2nm is a bit on the accurate side- call it 27 as you will never be accurate enough to fly to the decimal point of a mile and so on

I've not got a plog/map handy and its been ages since I did VFR navigation but you are going along the right lines (excuse the pun) just pick up you're navigation PPL study book and it will all be in there... even volume one on flight training will have navigation techniques in it.

Hope that helps a bit. It may be too difficult to explain how to use the whizwheel on here so you're better off using the whizzwheel guide that comes with it and practicing from your navigation text book

Chris, I just did a quick search on youtube and there's a bunch of tutorials on the whizzwheel. I haven't sat through them but Im sure you'll find some useful stuff here or in the related videos

YouTube - E6B Flight Computer: Introduction!

Thanks all!!