(67) Program Search/Request

[Gene222]

(10-19-2018 08:18 PM)Gene222 Wrote:  I am not a yachtsman, but I think you will find some of the formulas in the "Inshore Navigation" chapter, under sections "Current Sailing" and "Distance, Time, and Speed", as well as the discussion on vector addition.

I was looking at the article again by Joe Diamond from the first post and realized that the drawings on page 2 was about calculating the tacking angle and time for a sailboat. In the book "The Calculator Afloat" (1980 edition), tacking angle formula's are covered in the Miscellaneous Computations chapter from page 209 to 218.

The article talks about a custom sailing program for the HP-67, but goes on to say sailing programs can be run on the HP-25c, Texas Instruments SR-52, and HP-67/97. I think the author's custom HP-67 program was written based on the sailing programs from the Texas Instruments SR-52 NG1 Marine Navigation Library or the TI-58/59 Marine Navigation Library. I don't think the Nav Pac for the HP-67 had these type of sailing programs. The manual for the TI-58/59 Marine Navigation Library can be obtained from this web site www.rskey.org. The program code for the SR-52 NG1 Marine Navigation Library are also available from the same web page. The sailing programs in the Navigation Library include (1) Modified Wind, (2) SMG, CMG and Time to Lay-Line, and (3) Distance and Bearing to Mark.

The Coastal Navigation and Sailing & Tactics sections of the TI Navigation Library was prepared with the help of Mortimer Rogoff, who authored the book "Calculator Navigation".