NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: I knew where we were, but where are we now?
From: Pierre Boucher
Date: 2006 Jun 24, 10:47 -0400
From: Pierre Boucher
Date: 2006 Jun 24, 10:47 -0400
40 deg 07 min N -> 40.12 (rounded) 44 deg 37 min W -> 44.62 (rounded) not needed Course 090 -> Course N 90 E distance traveled 56.88 Nm To find DLat (difference of latitude in minutes of latitude) distance traveled x cos(course) = Dlat 56.88 x cos 90 = 0 To find DLo (difference of longitude in minutes of longitude) distance travel / cos(mid latitude) 56.88 / cos 40.12 = 74.4 = 1 deg 14.4 min (Eastward) New DR? New latitude 40 deg 07 min N + 0 = 40 deg 07 min N New longitude 44 deg 37 min W - 1 deg 14.4 min = 43 deg 22.6 min W Pierre Boucher Guy Schwartz a ?crit : > This has probably been discussed here before, but hopefully someone will help me out. I'm trying to find the formula for caculating your DR after traveling from a know position. > For instance: > Last Fix > 40 deg 07 min N > 44 deg 37 min W > Course 090 > distance traveled 56.88 Nm > New DR? > It would be a big help to me if someone that knows the formula could incorparate the above example so I could follow along. > Thank you, > Guy
