Geoffrey, cool it old chap...
OK, as a student lets talk about degrees... A pilotage trick is in knowing
that if you change the angle by one degree, lets say to the left, you will
be left of your desired track by 1 nm after you fly 60 nm.. (1 in 60 rule)
If it is 2 degrees then you will be off to the left by 2 nm...
And with shorter distances for a 2 degree change, you will be to the left by
1 nm in half the distance (30 miles) and left of track by a half nm in 15
miles... So if a B airspace is 30 nm across and you start out with a 2
degree error you will be off your desired track by one half mile when you
reach the center... Unless the vfr tunnel is very narow, wind drift will be
a bigger factor than heading error...

This rule comes from hundreds of years of ship navigation... Do a google on
the term "navigation 1 in 60 rule" and you should get hundreds of hits...
See, not that difficult to visualize once you have some numbers to go by...
denny
"Geoffrey Barnes" wrote in ... sigh...

I'm a student pilot, for crying out loud! I have no idea if 2 or 3
degress
will make a difference.