Compass has been a navigational aid tool from the time of early exploration. They have changed the way mariners travel across the globe. With the advancement of technology, there are different kinds of compass that can comprehend various navigational needs.
Importance at Sea
Magnetic compasses are the magic tool of every man in the sea. Oceans and seas are a dangerous place to lose direction. Journeys require reliable tools to ensure smooth sailing. From early exploration to today, the compass has remained essential for navigation.
Choosing the Right Compass for Your Boat
Before buying a compass for your boat, it is important to know the exact requirement.
A large compass is needed for viewing from greater distances.
The color and design should ensure compatibility with the boat.
Compasses are essential equipment on boats, yachts, and ships.
There is a wide range of compass types such as Magnetic, GPS, and Astrocompass, with the general purpose being to steer a boat on a magnetic heading.
Types of Compasses
Magnetic Compass
Magnetic compasses were first used by the Chinese around 1044. Since then, they have been installed on almost every boat.
Function: Works on Earth’s magnetic field, pointing north.
Usage: Helps mariners check the position of their ship, plot lines, and avoid collision.
Bearings: Two bearings 45° apart can provide a fixed position, while a third bearing ensures smooth sailing.
GPS Compass
GPS compasses use geosynchronous satellites to determine exact location and direction.
Advantage: More reliable than magnetic compasses as they are not affected by Earth’s magnetic field.
Accessibility: Widely available, even in smartphones.
Cost: Often cheaper compared to advanced marine instruments.
Electronic Fluxgate Compass
Fluxgate compasses work when wire coils wound around magnetic material align with Earth’s magnetic field.
Advantage: Digital output can be transmitted to displays, aiding autopilot.
Limitation: Sensitive to local magnetic fields, but modern systems can compensate electronically.
Flexibility: Remote-mounted sensors reduce interference.
Compass Placement on Boats
Alignment and Positioning
Compass must align with the fore and aft line of the boat.
Typically placed amidship for accuracy.
If offset, the distance must be measured from the boat’s fore and aft line.
Material Considerations
GRP Boats: Hull does not interfere with compass.
Steel Boats: Steel’s inherent magnetism can disturb the compass; correction is made with fitted iron spheres or washers.
Avoiding Interference
No magnetic systems (e.g., loudspeakers) near the compass.
Display charts and plotters must be installed at the recommended “compass safe distance”.
Large compasses have higher directive forces compared to smaller ones. If you are planning to buy the best magnetic compass system in Dubai, consult the marine equipment experts at Maritronics.
With over four decades of service, Maritronics provides reliable resources and expertise to help you find the right magnetic compass services in the UAE for your sail.
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