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Lesson 5 - Position Fixing

Overview

Position fixing determines where you are at sea. This is essential because steering inaccuracies, wind, and tidal streams can push you off course.

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​Single Fix

One of the simplest techniques involves spotting a clear landmark, like a lighthouse or buoy, and matching it to your chart. Ideal for coastal navigation.

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Position Line

A position line shows where your boat must lie based on an observation, such as a compass bearing, radar range, or visual transit. Two intersecting lines give an accurate fix.​​​

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​​​​GPS

GPS uses satellites to pinpoint your location with remarkable accuracy. Systems like dGPS and WAAS correct errors for even greater reliability.

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Quick Plotting Techniques

  • Range and bearing allow quick fixes. 

  • Use the "fastest last rule" to prioritize bearings for the most accurate results.​

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​Cross-Track Error (XTE) & Chart Plotters

XTE shows how far off your planned route you’ve drifted. Chart plotters provide real-time updates, making navigation faster and easier.​

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Traditional Navigation Methods

Techniques like the three-point fix, transits, and depth contours are reliable backups and great for cross-checking GPS data​​

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Transits

Techniques like the three-point fix, transits, and depth contours are reliable backups and great for cross-checking GPS data

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Depth Contours

If you’re in shallow water, depth contours can act as position lines when matched to your chart.

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