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--- Joel Jacobs  wrote:


> I thought Chuck was talking about using equal
> altitudes to calculate LON. ...
>
> There is no E or W prime vertical involved, no
> azimuths that are N or S of
> the ship's position. Yes, there can be some
> adjustments to make, but the
> aren't key to the procedure.
>
> So I ask you where did I go wrong in understanding
> what Chuck was offering?

Joel,

I guess I made the mistake of addressing two separate
topics in one email:

1. Longitude by equal altitudes before and after LAN,
which I described (I hope clearly enough) as an
approximate (or "lifeboat navigation") method, and

2. Time sights at the time of prime vertical crossing.

Sorry for the confusion.

Best regards,

Chuck Taylor
North of Seattle


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