[don1reed]

Ah, I see what you're getting at, jmr.

Sorry for adding to the confusion.

It all depends on perspective...

as in...

I'm referring to ... Relative to your AP (+ or -) not actual mathematical quantities.

For instance when I say HOMOTO, I mean when your Ho is greater than the Hc, then from your assumed position (AP) measure off the intercept distance in nautical miles toward the body.

Conversely, if Hc is greater than Ho, then from your AP, measure off the intercept distance Away from the body. I hope that's understandable.


If, for example, our Hc > Ho and our resulting intercept was 23 nm Away and our Zn = 271*, this means we would construct a straight line from our AP, 23 nm in the direction of 091*, the reciprocal of 271*. Our heavenly body's GP (ground position) bears 271* from our present assumed position, and we are constructing a LOP 23 nm away from the body's GP relative to our AP.

Mathematically the realNav tutorial is correct. That is, from our AP Ho(if larger than Hc) is closer to the GP and therefore our distance to the GP is shorter (-). Away would be farther away from our AP and therefore (+).

BUT, what I'm trying to convey is the idea of construction of the actual intercepts.

If Ho > Hc, then the intercept will be drawn Toward the body.

If Hc > Ho, then the intercept will be drawn Away from the body.

Ales Klar?