NavList:
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Re: Nav Exercise #3- Azimuth of the Sun
From: Gary LaPook
Date: 2008 May 27, 00:23 -0400
From: Gary LaPook
Date: 2008 May 27, 00:23 -0400
Gary LaPook writes: Per online Nautical Almanac, http://www.tecepe.com.br/scripts/AlmanacPagesISAPI.isa the GHA of the sun was 248� 23.1' making the LHA 30� 45.8' and the declination 17� 22.1' south. The true azimuth computed with a Bygrave slide rule was 222� 25'. The gyro error was 35' (223� minus 222� 25'.) The true heading was 124� 25', (125� minus the same 35'.) The magnetic heading was 124� 37' (124� 25' plus 12' of westerly variation.) The deviation was 14� 37' east. gl Anabasis wrote: >Since we have a recent post and some discussion of checking the >compass at sea, here is an example of a afternoon Azimuth of the sun I >shot while underway from South Korea to Saipan, CNMI: > >Azimuth of the Sun > >On 11 November 2006, a ship was in position Latitude 17 deg 38.6� >North, Longitude 142 deg 22.7� East. At 04h 17m 31s UTC, a gyro >bearing was taking of the sun. The observed gyro azimuth was 223.0 >degrees. The ship�s heading was 125 deg per gyro compass, and 110 >degrees per magnetic compass. Local Variation was 0.2 deg West. >Determine the Gyro compass error, magnetic compass error and deviation >of the magnetic compass at that heading. > >As usual, I will standby for any questions and will post my reduction >in a day or two. Please note how you came about your answer. Did you >use tables, if so, which ones? Was it a calculator, computer etc? > >Thanks, and have fun! > >Jeremy >> > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
