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    Re: How to pre-calculate for negative altitudes?
    From: Greg Rudzinski
    Date: 2017 Oct 23, 12:45 -0700

    Tony,

    If you really want to show off on emergency navigation then buy or make a Bris sextant (search Bris in archives). Use the Pub 249 one page long term almanac for Sun data (PDF attached). Time /reduce by Casio calculator watch and natural trig tables. Plot on a pilot chart with small Douglas style protractor. 

    Greg Rudzinski

    From: Tony Oz
    Date: 2017 Oct 23, 09:02 -0700

    Dear Frank,

    Thanks for the formulas. As I expected - it is a try-and-error process with several inter-dependent variables.

    If I had a time machine - I'd certainly pay a visit to Mr Claudius Ptolemy with my FREIBERGER, Casio fx-85ES Plus and a watch I recently found on a flee-market. :)

    Regarding the SR/SS-tables: apart from the Calcutainment™ I hope to practice all sorts of emergency navigation as a lesson during a normal non-emergency yachting vacations. A friend of mine is a captain on a hire yacht, he is interested in my navigation studying.

    Warm regards,

    Tony



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