This module explores the effect of environmental influences to understand their impact on our vessel’s progress over a chart. It builds on skills learned in previous modules and teaches how to find and incorporate water movement (tidal drift) and wind (leeway) to our likely position.
It covers Dead Reckoning (DR) & Estimated Positioning (EP), two plotting techniques used to understand where we are and where we are heading. It also explores the effect of leeway (wind) on our vessel.
Module Prerequisites
Before learning how the environment will affect you, you need to understand charts and positioning and have some tidal knowledge. You can’t consider the effect of something when you don’t know where you are or what impact it might have!
Don’t worry; we’ll walk you through each step step-by-step, making sure you are confident in the subject.
Learn tools and techniques to position yourself on a chart visually & electronically.
Skills Covered
This module discusses the impact wind and tide have on a vessel. It covers where to find information on tidal streams, including the Nautical Almanac, charts, and mobile apps. Once completed, you’ll be better prepared to evaluate the impact on a vessel. Moreover, you’ll have the Plotting Positions Insignia to brag about!
Plotting Positions
Learn how to plot positions on a chart using tide, boat speed and direction.
Module downloads:
Downloadable resources are to support learning, not a pre-requisite for the sessions. You only need to download or print something if it helps your understanding of a topic.
Adjustments for Variation
This handy mnemonic helps us remember which way to apply adjustments for bearings. Magnetic (compass) to True, True to Compass, Easterly Variation or...
How to plot an Estimated Position
A step-by-step guide showing how to plot an Estimated Position. This chart plotting technique is taught in the Plotting Positions module of the Day Skipper...
How to plot Dead Reckoning
A step-by-step guide showing how to plot Dead Reckoning. This chart plotting process is taught in the Plotting Positions module of the Day Skipper theory...
Chart Annotations
Standard annotations for use when navigating using charts or chart plotters. Using standards enables navigators to understand each other's work. This...
Tidal Hour Calculation Sheet
Worksheet for calculating the hour-of-tide when looking up tidal stream information from a tidal diamond table or atlas.
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Module Content
Module Includes
- 3 Topics
- 8 Sessions
- 1 Exercise
