NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Silicon Sea: Leg 83 answers
From: Dan Hogan
Date: 2002 Sep 20, 09:41 -0700
From: Dan Hogan
Date: 2002 Sep 20, 09:41 -0700
On 19 Sep 2002, at 16:26, Paul Hirose wrote: > 1. The navigator should see the peak of Mauna Loa about 135 miles out. OK > > 2. TC = 286. Subtract 1 degree for current. Subtract 11 degrees for > compass error. CC = 274 to Mauna Loa. OK > > 3. Nearest multiple of 15 deg longitude is 150W, so we are 10 hours > behind UT OK. > > 4. DR at 140 mile point is 19 24 N 154 32 W. OK > > 5. TC = 305. Add 1 degree for current. Subtract 11 degrees for compass > error. CC = 295 to pass Cape Kumukahi. OK > > 6. Distance from passing Cape Kumukahi to Hilo entry point is 26 > miles. OK > > 7. Total DR distance from the running fix to Hilo entry point is 177 > miles. At 10 knots we should arrive there July 17 about 0100Z, or July > 16 1500 ZT. That ignores any current. Someone is off on the time. RFIX 01:44:36 UT @ 16/07/2001. We are in ZD +10. > > > I used a piece of typing paper to make a plotting sheet. The horizon > distance and heading computations were done on an E-6B aeronautical > slide rule. The wind side works perfectly well for current; you just > mentally divide the speed markings by 10 or 20. This is the way I navigated for years. I still do on my boat, when I go long. I still carry my original Dalton E-6B. Dan Hogan WA6PBY C27 "Gacha" dhhogan1@earthlink.net Nav-L Page: http://www.wa6pby.com
