CPT 190 Magnetic Compass
Type CPT-190 Magnetic Compass is table model steering compass for marine small and middle vessels. Its advantages are high precision, stable performance, and easy to operation and maintenance.
- Product Introduction
Ruian Shunfeng Navigation Instruments Co.,Ltd: Your Leading Magnetic Compass Supplier
Ruian Shunfeng Navigation Instruments Co.,Ltd.is an enterprise in professional manufacturing "Shun Feng" brand marine navigation equipments and fittings . The company was established in 1980 and is located in C District, An Yang Industry, Rui An City, Zhe Jiang Province. The company covers an area of 5.98 mou and a building area of 4,000 square metres. The company is close to Yon Tai Wen expressway and 104 national highways, traffic is very convenient.
Why Choose Us?
Quality products
We have the most advanced production equipment, and our products are approved by China Classification Society and China fishing boat inspection bureau and obtain CCS and ZY type approval certificates.
Rich experience
Since its establishment in 1980, we have been widely recognized and highly praised by enterprises and consumers for our excellent quality and thoughtful service.
Reliable service
Our team is committed to providing reliable and consistent service, ensuring that you receive high-quality products and customer support from us every time.
Professional team
The company is in possession of numbers of senior engineers and has abundant technique power, well conditioned equipment and technology comes to perfection.
What Is an Magnetic Compass?
An magnetic compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north. Other methods may be used, including gyroscopes, magnetometers, and GPS receivers.
CPT 190 Magnetic Compass Calibration And Adjustment Steps
The shipping company usually arranges a compass calibration master to calibrate the ship every year and issues a self-contrast curve table. However, due to the characteristics of the bulk cargo, such as the loading of iron ore, the magnetic field on the ship changes drastically, which often causes the magnetic compass on the ship to be too large, and completely contradicts the self-difference curve of the compass correction card, which is easily listed as a missing item when inspected. Therefore, if the magnetic compass is too large on the ship, it should be self-calibrated to avoid being listed as a missing item by the PSC inspection.
In the four main headings (N, E, S, W), the vertical and horizontal magnetic bars can be used to correct the semi-circular self-difference. The mouth can be applied: east east, west west, east and west, west east.
The shipping company usually arranges a compass calibration master to calibrate the ship every year and issues a self-contrast curve table. However, due to the characteristics of the bulk cargo, such as the loading of iron ore, the magnetic field on the ship changes drastically, which often causes the magnetic compass on the ship to be too large, and completely contradicts the self-difference curve of the compass correction card, which is easily listed as a missing item when inspected. Therefore, if the magnetic compass is too large on the ship, it should be self-calibrated to avoid being listed as a missing item by the PSC inspection.
In the four main headings (N, E, S, W), the vertical and horizontal magnetic bars can be used to correct the semi-circular self-difference. The mouth can be applied: east east, west west, east and west, west east.
This slogan means that in the southeast (S, E) or northwest (N, W) navigation, the compass position measured by the self-difference is larger than the magnetic orientation IE, the west self-difference), and the soft iron should be close to the compass, or Add a soft iron piece; if the compass position is smaller than the magnetic direction in these two directions, the soft iron should be moved outward. In the northeast (NE) or southwest (SW) flight direction, if the compass is in a large orientation, the soft iron should be moved outward; if the compass is small, the soft iron should be moved inward.
Step:
1. The magnetic heading of the ship N and S is demagnetized (or C-wheel) by adjusting the transverse bar.
2. The magnetic heading of the ship sailing E and W is demagnetized (or B round) by adjusting the longitudinal magnetic bar.
3. The magnetic heading of the ship navigating NW, SE, NE, and SW is demagnetized by adjusting the soft iron box (or ball).
The Principle of Magnetic Compass
The earth is a large magnet. It has a magnetic field on its surface. Its two poles are close to the earth's two poles, but they do not coincide and it moves very slowly. We call the pole near the north pole of the earth the magnetic north pole, and the pole near the south pole of the earth is called the magnetic south pole.
A magnetic needle with a fulcrum in the middle, when no ferromagnetic matter is around it, one end of the magnetic needle points to the magnetic north pole, and the other end points to the magnetic south pole.
Everyday we use the magnetic compass, its core part is the floating chamber. In order to obtain sufficient north force. Usually two or four magnetic bars are installed in the floating room. The magnetic bar is under the action of the earth's magnetic field, with one end pointing to "north" (ie magnetic north) and the other end being "south" (ie magnetic south). Then fix a dial around the float chamber and make a baseline on the compass bowl. So we can see the direction. However, the "north" referred to by the compass refers to magnetic north is not true north of the earth's true meridian. The error between magnetic north and true north is called magnetic difference.
How Does an Magnetic Compass Work?
Near the "true north" point of the earth is a location near but not exactly on the rotational north axis. (true north), remembering that in a magnet, like poles repulse, and unlike poles attract, we have a situation that allows us to make a compass.
A metallic pin that is magnetized, when set in a low friction bearing will be attracted to the magnetic pole. Remembering that this attraction is very weak, the bearing must be almost frictionless.
So, the north magnetic pole and the south pole of the pin pull on each other magnetically. The pin turns on the bearing until it points at the oppositely charged pole, and that gives us the direction of the north magnetic pole. The end of the pin is marked as north since it points in that direction.
Remembering that the north magnetic pole is not actually located at the earth's axial (true) north pole, the compass will be off by some amount. That amount changes slightly, over time, depending on the conditions at the core of the earth over the decades. The accuracy also is affected by your location on the earth while reading the compass.
Types of Magnetic Compass
Prismatic compass
A prismatic compass is a type of magnetic compass which is used to line up with an object to determine its bearing. It has a glass prism or a lens along with a lid. They also consist of a magnifying glass, a light and a ruler to read maps. The image shown below depicts a prismatic compass.
Liquid compass
A liquid compass is a type of magnetic compass which has a magnetized needle and a circular disk card which is present inside a capsule filled with a liquid. The liquid can be anything. It can be lamp oil, ethyl alcohol, white spirits, etc. The image shown below depicts a liquid compass.
Marine compass
A marine compass can be defined as the type of magnetic compass which is used by mariners. It is mounted in a fluid and keeps rotating according to its orientation. It is mainly used on boats so that the direction does not get deflected due to its movement. The image shown below depicts a marine compass.
Solid state compass
A solid state compass can be defined as the type of magnetic compass which is present in electrical devices. Generally, they have two or three magnetic sensors present in them, which can read data as well as the orientation of the device. They are generally present in mobile phones, clocks, etc. The image shown below depicts a solid-state compass.
GPS compass
A GPS compass can be defined as a type of magnetic compass which uses satellite signals to navigate. They can detect accurate locations as well as the position of a person. It is also used to calculate the cardinal directions of the Earth. The image shown below depicts a GPS compass.
Base plate compass
A base plate compass can be defined as a type of magnetic compass which has a liquid filled inside of it. It has a rectangular base which is made up of transparent plastic to read a map. It also consists of a ruler, a light and a magnifying glass to read maps with ease. The image shown below depicts a base plate compass.
How Was the Magnetic Compass Invented?
The magnetic compass is a navigation tool that uses the Earth's magnetic field to determine the direction of north. It is not clear exactly when or where the magnetic compass was first invented, but it is believed to have originated in China during the Han Dynasty (206 BCE – 220 CE).
According to legend, the magnetic compass was first used by the Chinese philosopher and politician Zhuge Liang (181-234 CE), who is said to have used it to predict the movements of the sun, moon, and stars. However, the first written record of the magnetic compass being used for navigation is from the Song Dynasty (960-1279 CE).
In the early days of its use, the magnetic compass was primarily used for navigation on land, particularly for military purposes. It was also used for divination, as some people believed that the compass could be used to predict the future.
Over time, the magnetic compass was adapted for use on ships at sea, where it became an essential tool for navigation. It allowed sailors to determine their direction and keep track of their position, even when they were out of sight of land. The magnetic compass has continued to be an important tool for navigation to this day, and it is used in a variety of applications, including aviation, surveying, and outdoor recreation.
Why You Need an Magnetic Compass?
During the last century, other instruments have become more user-friendly, such as the gyro compass which points to true north, and recently the satellite compass, which relies on satellites for information and also points to true north. The magnetic fluxgate compass, which uses the earth's magnetic field for direction, is also used with automatic pilots and works in a very limited magnetic field.
The gyro, the satellite and fluxgate compasses are reliant on electrical power to make them work. This, among other reasons, is where the magnetic compass has the advantage; it does not rely on an external power sauce.
How do you fix this problem? One has only to apply a small calculation for it to read true north. To make the magnetic compass accurate and perform properly, it has to first be placed in the fore and aft line of the boat. If it can be mounted on the centreline of the boat, it can be aligned with the bow of the vessel. This is the preferred position. If this is not possible, then the compass should be placed either side of the centreline but must be parallel to the centreline of the vessel. This alignment is most important as the compass will have a permanent error in it if it is not aligned properly in the fore and aft line of the boat.
Final adjustment to the magnetic compass can be achieved by built-in corrector magnets (compensators) being adjusted. This can be done by the owner, or preferably, by a licensed compass adjuster who will check, adjust and supply a certificate of deviations for the vessel. The only errors to be applied to the magnetic compass are (a) variation and (b) deviation. These are combined to give the total correction to obtain the true course.
Both of the above errors can be easily dealt with. Firstly, variation is depicted on the chart for your area and is reasonably constant for the gold coast, which is around 11 degrees "east", which is a plus(+). If the compass has no deviation, then the magnetic course is what the compass is showing, and the true course is + 11 degrees. Simple! If, however, your compass has "known deviations" (a table of deviations for every 10 degrees of heading), this additional error is applied, plus or minus, to the variation, and then applied to the magnetic course to provide the true course.
All the above sounds very off-putting, but if the compass is compensated correctly to within 1 or 2 degrees it will not be necessary to make any mathematical calculations unless you are working off a chart. If your chart plotter is set to magnetic, then your compass should be reading close to that heading remembering that the plotter is giving "course over the ground" and your compass is giving the "direction of the boat's head".
The Magnetic Compass in Maritime
The principle of magnetic compass has not been changed for a long time and it's still being followed. It essentially consists of a magnetized needle pivoted over a horizontal plane.
Magnetic compass is one of the major maritime navigational equipment and its usage is critical. Simply put, a magnetised needle, suspended freely, points north because of the forces caused by the earth's magnetic field. Once north is known, the other directions are easily found. A correctly adjusted compass of a ship is always sailor's best companion. The main advantage of a magnetic needle is that it doesn't need any external power. As long as earth's magnetism exists, a properly adjusted compass will show you correct directions. It works well in most of the navigable waters of the world, except areas closer to magnetic poles. Readings from compass can be easily corrected, variation & deviation is readily available onboard at all times.
The present day magnetic compass has been developed from understanding the laws of magnetism which govern the behavior of the compass, greater precision in the construction of compass and better means to control damping of the compass needle.
Our Certificate
All our products are approved by China Classification Society and China fishing boat inspection bureau and obtain CCS and ZY type approval certificates. Our company has been found to conform to Quality Management System standard ISO 9001:2000 approved by China Classification Society Quality Assurance (CSQA).
FAQ
Q: What is a magnetic compass simple definition?
Q: What is the use of magnet in compass?
Q: What is a compass short answer?
Q: What is the magnetic compass on a ship?
Q: Is a compass just a magnet?
Q: Can a magnet mess up a compass?
Q: Can a magnet throw off a compass?
Q: What happens if you put a compass next to a magnet?
Q: What is a compass and why is it important?
Q: Why do sailors use a magnetic compass?
Q: How did sailors use the magnetic compass?
Q: How do you read a compass for beginners?
Q: Does a compass always point north?
Q: Why do compasses not point south?
Q: Why would a compass spin?
Q: Can a compass point south?
Q: Who invented the magnetic compass?
Q: What did the compass allowed sailors to determine?
Q: How do you use a magnetic compass?
Q: What makes a compass not work?
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