Navigation Flashcards
How many IALA regions?
2
IALA
International association of lighthouse authority
What is variation?
Ships compass is effected by earths magnetism
What is deviation?
Ships compass is affected by ships metals, electronic equipment.
GMT
Greenwich Mean Time
DR
Dead reckoning
DIW
Dead in water
Explain true bearing:
Any bearing in relation to true north given from 000 to 359 degrees.
Explain relative bearing:
Any bearing in relation to the ship given from 000 to 359 degrees.
From what and where are the navigation light operated from?
Telltale Panel on the bridge behind the Helm
How many navigation lights are there?
5
What color is the port running light?
Red
What color is the STBD running light?
Green
What color is the FWD masthead light?
White
What color is the AFT masthead light?
White
What color is the stern light?
White
Name what is used over during man overboard?
Oscar flag, search light, life ring, smoke float
What is the stands called that house gyro repeaters for true bearing and fixed compass card for relative bearing?
Pelorus Stands
What is the name of the tool that QM’s use in conjunction with the pelorus to obtain bearing to visual navigation aids during transits through restricted waters?
Telescopic Alidade
What is the job of the QMOW?
To maintain navigation plot and be the eyes, ears, and voice of the navigator when he is not present.
What is the job if the conning officer?
To verbally drive the ship by giving rudder orders and speed orders to the helmsman and Lee helmsman.
What day shapes are flown for RESTRICTED MANEUVERING?
Ball-Diamond-Ball
What day shapes are flown for vessel AGROUND?
Ball-ball-ball
What day shapes are flown for vessel NOT IN COMMAND(DIW)?
Ball-ball
What day shape is flown for vessel CONSTRAINED BY DRAFT?
Cylinder
What lights are operated during man overboard?
Red on red flashing
What lights are operated on the mast during restricted maneuvering?
Red over white over red
What lights are operated on the mast during vessel at anchor?
Red
What lights are operated on the mast during vessel not under command?
Red over red
What lights are operated on the mast during vessel aground?
Red over red over red
What are the 4 flags flown during UNREP?
Golf
Romeo
Bravo
Prep
What tool is used by QM’s to obtain L.O.P.’s from celestial bodies
Marine Sextant
What tool is used by the QM’s to quickly plot L.O.P.’s during navigation details?
Parallel Motion Protractor (PMP)
What shape is an electronic fix?
Triangle
What shape is a visual fix?
Circle
What shape is a DR fix?
Semi-circle
What is another term for the Ensign that is flown from the main truck while underway?
The steamer
What 3 times are the commissioning not flown?
Precom
Decom
When admiral flag is flying
What is a Fathometer?
Measures depth of water
What is a clinometer?
Measures the list
What is a barometer?
Measures the amount of moisture in the air
What is the helm used for?
Steering the ship
What is the lee helm used for?
Control speed of the ship
What is the wind speed for GALES?
34-37 knots
What is the wind speed for storms?
48-63 knots
What is the wind speed for hurricanes?
64+ knots
What is the wind speed for small craft advisory?
15-3 knots
What day shape is flown for vessel AT ANCHOR?
Ball