Types of Sea Map

Map is the projection of the earth or a portion of the earth which depicted above the plane. Understanding leads to the folder over the general state, the state of the land and its boundaries seen from the political angle, while a map would be more concerned with things as well as the particulars required by a navigator to be able to determine the position, distance, direction and other halhal for safety or navigational safety.

The maps published by the nature of their use, such as a map for the flight (aeronautical charts), map the sea (nautical charts), weather maps (weather chart), map star (star chart) and others. For the purposes of dipakailah sea cruise on the sea map.

Know the Types of Sea Map

Know the Types of Sea Map:

1  small size scale: covering a wide area.

2 large size Scale: covering a narrow area.

Meanwhile, according to the map area is the sea can be divided into:

1. Ichtisar maps are maps that illustrate the broad areas on a small scale, mainly to provide current variation, wind and other 1: 3,000,000
2. Map bow / map nomads are maps with large scale used to cruise at a distance from the mainland of 1: 500,000 to 1: 1,000,000
3. Map of beaches are maps with larger scale, used for navigation along the coast of 1: 100,000 to 1: 500,000
4. Explanatory maps are maps for navigation in difficult voyage water 1: 25,000 to 1: 100,000
5. Maps are maps plan to stop in ports, pelabuhanpelabuhan 1: 10,000 to 1: 25,000

The scale of the map is the map scale comparison of one unit of length in the map to the actual length. To declare scale there are several methods used and the most frequently used are:

1. General scale (natural scale) for example 1: 80,000 means that one unit of length in the map, 80,000 on earth.
2. Scale numbers (numerical scale), for example 1 cm on the map = 10 km on the actual situation.
3. Scale chart (graphical scale). On the map there is often a line that has a division in the size of miles, yards, feet, kilometers, meters. Distances on this map can be measured by using the units on the line

General terms of sea maps;

1. Marine parts, must contain all the dangers that exist, and reliable picture of the depth of the water and the lines in.
2. These directions and distances should be stated so, so that navigation can be organized carefully.
3. Especially the figures in there should be and the smallest states in the waters. Also in the largest-in is particularly important with respect to the cross section of the seabed, special

to choose berths. For this purpose in addition to the determination of a ship, the type tanahpun should also be stated enough.

Flare-beacon, buoy-buoy, perambuan-perambuan, lines and stripes bow guide, berths should be written on the map.

Parts of the mainland, should not only show the shape and stripes beach alone, but must also be able to state whether the land is flat, hilly, steep or mountainous, while the boundary between the structures must be clearly established.

Titel map must declare the area described. In the title was mentioned in scale, which measures the deep and determined the high mountains, to which the field in the venting and if necessary the distance between the field (chartdatum) with sitting area intermediate (mean level), the name of the ship and the mapping .

Month and year of publication, or reprints are listed at the bottom and up to the date the map was last repaired.

Correcting the map (using BPI)

• If there are several questions that must be corrected, then the map with the largest scale shall take precedence. In this case the correction only one but includes some maps with different scales.
• In insert additions or corrections on the maps to the size of a large scale, the symbols and abbreviations of map No. 5011 or map No. 1 should be used.
• If in correcting enlightened too much change to be made, then in accordance with the scale, the temporal changes can be shortened by reducing the corrections according to the rules: a. The high sea level b. period c. numbers in group d. visible distance.
• For maps of the ocean, only flares that have appeared within 15 miles and more included. Apart from the visible range, which need only the color and nature.

Catalog of sea map:

British Admiralty (BA) published annually and contains the name, serial number, price and other marine maps of all kinds, as well as a list of publications useful navigation for sailors. This catalog is a special book about maps and the sea, there is an index map from A to W, which covers the whole world. This index will indicate the areas where we are and then we find we mean area (eg index K), so in this area we can see the maps which we need.

Folio of Map
Folio of the map will provide a set or series of maps are complete from a particular region or a part of this world with a certain geographical boundaries. Each folio has a name and serial number, and in addition there is also a list of the folio containing the number and names of the maps contained in the folio. By BA the world is divided into 100 folio and are numbered from 1 to 100.

Front Surutan Map (Chart Datum).

Front surutan map is the water level up to where in-depth of the venting. From this in-depth of water measured. So in the water on the map is never smaller than the actual water. The main intention is that peace of sailors remain assured about it in the water, especially in the harbor. On the map of Indonesia in the venting to the average of the lowest water taken every half year. The depth of water is calculated in meters. High objects on the ground is calculated from the highest water level and expressed in meters. Line of water therein is a line connecting the same place it