Author page: nautica

Passage plan planning

A detailed plan can now be prepared using fullest possible appraisal of intended passage considering all available information. We call this stage the planning stage. The plan should embrace the whole passage – from beath to beath In a...

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Passage plan execution

The 3rd stage of the passage plan is called execution. After the passage plan is finalized, the passage should be executed in accordance with the plan or any changes. When executing the plan the following factors should be taken into the account...

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Passage plan maintaince

Keep the following additional points in mind. Visual bearings is usually the most accurate means of possition fixing. Every fix should be based on at least 3 possition lines. Transit marks and clearing bearings may be a great assistance...

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Introduction

The major concern of the navigator while navigating near the coast or off-shore, is to determine his position as accurately as possible. So far, you have learned about the Dead Reckoning and the Estimated Position. In this lesson you will learn...

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Introduction 2

A Fix can be obtained by using any of the following methods: By combining cross compass bearings, by combining a bearing and a visual range, or by combining a bearing and a contour line. A fix can also be obtained by combining two or more...

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LOP introduction 2

The Visual Range LOP is the most precise and reliable LOP, since it is not dependent on a device such as compass or radar. This LOP can be obtained by observing two objects in line such as two buoys, or an island and a buoy, or two predefined...

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Running fix introduction

In this lesson we will learn about the Running Fix Position. Sometimes only one object is available for taking LOPs, for example a single buoy, a small island or rock, a radio tower and in celestial navigation during daytime, the sun. The Running...

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Running fix plotting

This is how we plot a Running Fix Position: Assuming the course is 080° degrees and the speed is 8 knots, or 8 nautical miles per hour, we take a bearing of 045° degrees on Alfa rock at 0900, now convert the compass bearings to true bearings and...

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Running fix 45/90

In the previous lesson we used a “running fix by doubling the angle on the bow”. Another method of plotting a running fix is the 45/90 method. The difference in the 45/90 method is that the angles used are specifically 45° and 90°...

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