HP-71B Software for navigation

[Erwin]

Hello,

I tried data from the book "Astronavigation" from Bobby Schenk (it's in german and a very good description to steering by sun) page 62f and page 69. The results are the same - except a little difference in the Intercept 0,3 and 0,2 miles. That is while the EXCEL and the BASIC program accepts integers while Bobbyy Schenks data for the estimated ship position is with commas.

So I ended up with 10 different cases between 2000 and 2018 and they all gave valid results or respectively the same as the examples.

Input is the "assumed position" (longitude and latitude), Date, Time and sextant readings, height of eye, ... Result is the direction and distance to the "lines of position" from the "assumed position".
This results helps drawing the the "lines of position" on a navigation sheet.The crossing from 2 sextant readings (you need at a minimum 2 calculated lines) is the position where you are.
If the vessel is moving between the two sextant readings you have to take in account the estimated DR position for the second measurement.

So now that's clear for me - I can't awaiting the sailing trip.

best regards
Erwin