Navigation Flashcards
What is GMT
Greenwich Mean Time
What is DR
Dead Reckoning
What is DIW
Dead In Water
What is the difference between true bearing and relative bearing
True bearing is relation to true north, Relative bearing is relation to the ship
From what and where are the navigation lights operated from
Telltale Panel on the bridge behind the helm
How many navigation lights are there
5
What are the navigation lights called and what are their colors
Port running light- Red Starboard running light- Green FWD masthead light- White AFT masthead light- White Stern light- White
What are the inport lights
Flag staff, Jack staff, Aircraft warning lights
What color is it for flight ops
Blue
Name one thing used during a 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 aid 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 of the Conning Officer
To verbally drive the ship by giving rudder orders and speed orders to the helmsman and lee helmsan
Day shapes for restricted maneuvering
Ball-Diamond-Ball
What is IALA
International Association of Lifehouse Authority
Day shapes for vessel aground
Ball-Ball-Ball
Day shapes for vessel not in commond
Ball-Ball
Day shape for vessel at anchor
Ball
Day shape for vessel constrained by draft
Cylinder
Lights operated for man overboard
Red on Red flashing
Lights operated for restricted maneuvering
Red over White over Red
Lights operated for vessel at anchor
Red
Lights operated for vessel not under command
Red over Red
Lights oprerated for vessel aground
Red over Red over Red
What are the flags flown during UNREP
Golf, Romeo, Bravo, Prep
What tool is used by the 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)
How is drag circle calculated
Distance from the hawespipe to the the center pelorus plus the chain let out
How is swing circle calculated
Length of the ship plus the chain let out
What shape is an electronic fix
Triangle
What shape is a visual fix
Circle
What shape is a DR fix
Semi-Circle
What is an emergency breakaway
When the ship separates itself from alongside another ship during UNREP using max rudder turn and max propulsion for speed
What type of breakaway does our ship do after an UNREP
Accelerated standard breakaway
Why doesn’t our ship do an emergency breakaway
We would collide to other ship due to our pivot point located at 100 frame
What is term passed to the bridge that must be logged into the deck log and also passed to the signal bridge so that flag romeo can be lowered, signifying that we are officially alongside the other ship
Messenger in hand
What 3 times are the commissioning pennants aren’t flown
Precom, Decom and when admiral flag is flying