Compass- Chapter 1 Flashcards
When should the magnetic compass be adjusted
When ship is built
Undergoes structural repairs/modification that could affect compass
Electronic Equipment is added/removed that could affect the compass
The compass becomes unreliable
Every 2 years except when regular compass errors taken
What will happen to the magnetic properties of a vessel over time
They will change
What are ferromagnetic materials
substances that can become magnetized and retain their magnetic properties even after an external magnetic field is removed.
This behavior arises from the alignment of magnetic moment within the material
What are magnetic moments caused by
spins of electrons
High Magnetic Permeability:
Can easily become magnitised
What are some key features of the binnacle
Protection: It shields the compass from the elements, such as wind and water, and minimizes the effects of external magnetic fields.
Lighting: Many binnacles are equipped with lights for nighttime navigation, allowing the compass to be read in low light conditions.
Stability: The binnacle often includes a gimbaled mechanism, which allows the compass to remain level even as the ship rolls or pitches.
Made of non-magnetic materials and elevates it clear of ferromagnetic materials and height makes it suitable for bearings to be taken
What is the binnacle
House of the compass
Where should errors of the compass be entered when they are regularly checked
The compass record book
What is variation
refers to the angle difference between magnetic north (the direction a compass points) and true north (the geographic north pole).
What is deviation
refers to the error in a compass reading caused by local magnetic fields, usually from nearby metallic objects or electronic equipment.
What is the formula for compass error
TrueHeading−AdjustedCompass
heading
Where is the binnacle located
Monkey island
The binnacle provides fittings for various devices used to adjust the compass, what are examples of compass correctors.
Magnets
Flinders bar
Quadrantal spheres
Where can the requirements for Magnetic Compass be found
SOLAS chapter 5 regulation 13
With regards to the centreline, where is the binnacle situated?
As far as possible on the centreline
