Scarecrow,

we used to estimate that if the mark was at or slightly behind the rear beam, we were on layline to the mark or whatever. This changed a little with different conditions and was based on the Tornado.

Now, how accurate do you jugde the "over the rear shoulder" method to be and was it different for weaker windes when not trapping or in chop? I liked the simplicity of the method so it is nice to know a bit more.

Since neck flexibility is usually restricted (unless you are an owl), it must mean that tacking angle is more than 90 deg