NavList:

Frank you wrote: As I have mentioned a number of times before, you can toss out all this noise about plotting if you use a simple "two-point" system instead of the intercept method. If you calculate two points on each LOP, the line is defined at least as well as it by intercept distance and azimuth (and sometimes better), and since azimuth doesn't enter the picture at all, you don't need conformal plotting sheets.

Are you suggesting that if you know the zenith distance and 90-dec, you can pick two close co-lats and use the PZX triangles to get two close LHAs and hence longitudes, or use two close longitudes and hence LHAs to get two close co-lats? Then just join the two positions to get the LOP?  DaveP