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Inspired by a viewer's email, I examine three simple but highly useful marine navigation instruments used to take relative bearings; convert between compass course and true course; and calculate distance, elapsed time, and distance covered.

Thank you to Tony Funtek for giving me the idea for this video.

0:00 Introduction
1:09 Pelorus Board
3:44 Theory of Magnetic Variation and Deviation
7:05 Course Corrector: Design and Use
9:39 Marine Computer: Overview
10:24 Marine Computer: Sample Calculations
11:19 Outro

SOURCES:
https://www.getlostpowerboattraining.com/compass-variation-and-deviation-how-to-calculate-them/
#:~:text=The%20word%20CADET%20reminds%20us,heading%2C%20we%20add%20easterly%20variation.&text=So%20we%20are%20going%20to,get%20back%20to%20true%20north.
https://autonauticinstrumental.com/wp-content/uploads/2020/09/Pelorus-00123-Manual.pdf
https://www.ripplerocksquadron.com/On_Water/Swinging%20the%20Compass%20Part%202.pdf
https://www.ion.org/Museum/item_view.cfm?cid=2&scid=18&iid=21