Harry Bloomfield wrote:
Bob Eager laid this down on his screen :
On Sun, 8 Jul 2007 19:59:49 UTC, Harry Bloomfield
wrote:

Bob Eager brought next idea :
What I did was this:

a) Get the location of the transmitter (dtg.org.uk I think) and find it
on the OS map.
b) Find my house on the OS map.
c) get the bearing of the Tx from my house.

You forgot the correction for magnetic variation.

Why? No compass involved at any stage (unless this is a wind-up). c)
is done with a protractor or simple trigonometry.

How do you translate the bearing of the transmitter to a bearing from
the house without a compass, if you cannot see the transmitter? You at
least need a compass to work out the direction the house faces.

The map has a sorta built in compass.