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» Online Classroom   » Celestial Navigation   » Public Discussion of Cel Nav   » Zn

Author Topic: Zn

 - posted August 06, 2023 05:50 PM      Profile for doliverb           Edit/Delete Post 
I assume the Zn (Azimuth Line) is the True direction to the object from the boat on the plotting sheet. Does this cause us any error if our log heading is given as Magnetic when we advance the running fix? Do we ever need to convert magnetic to true when using the plotting sheet? Thanks
David Burch

 - posted August 06, 2023 08:06 PM      Profile for David Burch           Edit/Delete Post 
Yes, that is true about the Zn. But there are no issues with magnetic headings. Your logbook will record the headings steered as magnetic but when you plot these for DR or advancing LOPs they must all be converted to true directions, unless plotting on a chart with a compass rose. Standard universal plotting sheets do not have a compass rose, so we make the manual conversions before plotting.
From: Starpath, Seattle, WA

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