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» Online Classroom   » Celestial Navigation   » Public Discussion of Cel Nav   » CelNav book - exercise 4.3 - parallel ruler?

Author Topic: CelNav book - exercise 4.3 - parallel ruler? John Pinto posted May 14, 2021 11:01 AM                   The instructions for exercise 4.3 says to use only dividers and the scale on the sheet. But shouldn’t we also be using a parallel ruler or protractor for some of the examples? Especially #6 to determine bearings? Also what’s an acceptable error when doing these exercises off the printable PDF of the figure? For #5 the difference I get from the answers is 0.5 nm for A and B and 1.0 nm for C and D. That seems to be inherent in using a PDF printout as you are going to get more distortion the greater the distance you are measuring. From: Orlando David Burch posted May 14, 2021 12:08 PM                   The note you refer to applies to the first 5 exercises. The 6th one is a different type of measurement that uses parallel rulers or a rolling plotter. Any of them might benefit from the use of a straight edge, but not strictly required, and a pencil. We have notes on using plotting tools here: http://davidburchnavigation.blogspot.com/2016/05/chart-plotting-tutorials.html We have notes on answers here: https://www.starpath.com/catalog/courses/answers.htm From: Starpath, Seattle, WA

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