A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2017 Feb 2, 08:21 -0800
Mike you wrote: How anyone can complete 6 or 7 LOP's and get the fix onto the plotting sheet while your still in the same hemisphere beats me.
Keep your hat on Mike it’s easier than it sounds. First you only need one assumed position. For a seven shot (but only two stars) sandwich fix you take shots about a mid-time. E.g. AABBBAA and average the intercepts on your astro form, so you only plot two azimuths and two LOPs on the chart from the same assumed position. For running fixes, stars A, B, and C say, you still only need one assumed position and just move the position lines or alter the intercepts using the famous (some might say infamous) MOO and MOB tables (Tables 1 and 2 in AP3270/HO249). Also, in multi crew military aircraft you had a Nav-Radar to pre-compute, shoot, and finally check the celestial, a Nav-Plotter to record and plot the celestial on the chart (both navigators checking each others maths when time allowed), and with good crew cooperation, a first pilot to note heading changes, a second pilot to note speed changes, and an electronics officer to call the timing, so it was family fun really. You just had to remember not to wind up the sextant again before you’d called out the previous reading. DaveP