Nautical Charts. Types of Scales

April 11, 2017 SorinMStamate No comments exist
Nautical Charts. Types of Scales
Nautical Charts. Types of Scales

Nautical Charts. Types of Scales.

The Nautical Charts showing the Earth’s surface or a portion thereof on a plan, in a certain proportion (scale) and with deformations subject to mathematical laws.

Such a chart must meet the following conditions:

1. The quick and easy insertion of the geographical coordinates of a point;

2. The angles on the chart to be equal to those on the surface of the Earth;

3. The rhumb line and the great circle can be drawn by a straight line.

On a chart are shown a lot of elements using abbreviations, symbols, explanatory notes, warnings, namely:

a. The coast line;

b. The seabed topography;

c. The nature of the seabed;

d. Dangers for navigation;

e. Navigation aids;

f.  Natural and artificial navigation landmarks;

g. The magnetic declination and magnetic anomalies;

h. The elements of the tide and currents;

i.  Places for anchorage;

j.  The boundaries of the different regions;

k. Fairway.

The nautical charts are divided according to the scale in four categories:

1. General charts:

– Drawn at a scale between 1: 500,000 – 1: 5,000,000

– Are represented large oceanic basins and are used for:

·         Study of the navigation conditions;

·         Preparing the sea passage;

2. Route charts:

– Drawn at a scale between 1: 100,000 – 1: 500,000

– Used for navigation at deep sea or near the coasts;

– On which are represented the most important elements for navigation;

3. Coast charts:

– Drawn at a scale between 1: 50,000 – 1: 75,000;

– Used for navigation close to land, among islands, fjords, straits;

4. Plans:

– Drawn at a scale between 1: 5,000 – 1: 25,000;

– Used for operating in ports, roads, gulfs and bays.

For navigation purposes are used the following cartographic projections:

1. Mercator’s projection:

– With Rectangular Canvas;

– And the rhumb line appears as a straight line;

2. Gnomonic projection:

– Used for the navigation on the great circle;

3. stereographic projection:

– Used for navigation in the polar regions.


Nautical Charts. Types of Scales _ v1.0
Nautical Charts. Types of Scales _ v1.0

To download this Excel file, please click the button below.

Leave a Reply

Your email address will not be published. Required fields are marked *

The following GDPR rules must be read and accepted:
This form collects your name, email and content so that we can keep track of the comments placed on the website. For more info check our privacy policy where you will get more info on where, how and why we store your data: Privacy Policy

This site uses Akismet to reduce spam. Learn how your comment data is processed.