HP-71B Software for navigation

[Erwin]

Till now I spent many hours to investigate the program. It has some other faults in the original program too - calculating mixed navigation, great circle navigation all ends in errors (about data type i.e.).
There are no other inputs from the community, it's a pity cause I love my HP71b for all my calculations and the program seems to be a "all in one" - but I stop my trying on this program cause for me it is to time consuming to do "reverse engineering" of the program. Additionally I couldn't find out the syntax for the ephemerides program to update it to the actual data.

Maybe I'll make a basic program for my needs (dead reckoning, great circle and rhumbline calculations) out of the known formulas. But no calculations with ephemerides and sextants on the HP71b.

A very good book with basic information and programs and explanations for the HP67 ist the "Calculator Navigation" from Mortimer Rogoff.
Another one a have is "The calculator afloat" from Henry Shufeldt. Both books include formulas and programs for RPN calculators - maybe I'll use my HP67 on my summer trip.

regards
Erwin