Formulas, Numbers, Numonics Flashcards
What is the Numonic SIREN
S: Starboard I: Inward R: Red E: Even N: Nun
What is the 2 + 2 Rule?
Used to find a reciprocal course: Take the first number of the current course. Add two if possible, if not subtract two. Then do the opposite to the second number of the course. This will give you the reciprocal. ie; if you add two to the first number then subtract two from the second number, if you subtract two then add two to the second number. 065 becomes 265 by adding to the first, then 245 by subtracting the second.
With barometric pressure, a one inch of mercury increase in pressure equals a ______ inch decrease in water level.
You could have answered with any of the following: 1. 13.6
With barometric pressure, a one hectopascal or millibar increase in pressure equals a ______ centimeter decrease in water level.
You could have answered with any of the following: 1. 1 2. one
Standard barometric pressure equals _______ inches of mercury.
You could have answered with any of the following: 1. 29.92
Standard barometric pressure equals _______ millimeter of mercury.
You could have answered with any of the following: 1. 760
Standard barometric pressure equals _______ hectopascals or millibars.
You could have answered with any of the following: 1. 1013.25
A nautical mile is equal to _____feet.
You could have answered with any of the following: 1. 6076
A nautical mile is equal to _____ statute miles.
You could have answered with any of the following: 1. 1.15
A nautical mile is equal to _____ Kilometers.
You could have answered with any of the following: 1. 1.85
A nautical mile is equal to _____ meters.
You could have answered with any of the following: 1. 1852
A nautical mile is equal to _____ yards.
Commonly 2000 yards Actually 2025 yards You could have answered with any of the following: 1. 2000
A nautical mile is equal to _____ minutes of latitude.
You could have answered with any of the following: 1. 1 2. one
A nautical mile is equal to _____ cables (British).
You could have answered with any of the following: 1. 10 2. ten
A cable (British) is equal to _____ nautical miles.
You could have answered with any of the following: 1. 1/10
A cable (British) is equal to _____ feet.
You could have answered with any of the following: 1. 608
A cable (U.S.) is equal to _____ feet.
You could have answered with any of the following: 1. 720
A cable (U.S.) is equal to _____ shots.
You could have answered with any of the following: 1. 8
A shackle is equal to _____ shots.
You could have answered with any of the following: 1. one 2. 1
A shackle is equal to _____ feet.
You could have answered with any of the following: 1. 90
A shackle is equal to _____ fathoms.
You could have answered with any of the following: 1. 15
A VRM of 0.017 approximately equal to _____ feet.
You could have answered with any of the following: 1. 100
One kilowatt equal to _____ horsepower.
You could have answered with any of the following: 1. 1.35
One horsepower equal to _____ kilowatt.
You could have answered with any of the following: 1. 0.74
A meter is equal to _______ feet?
You could have answered with any of the following: 1. 3.281
What is the formula for visual geographic range to the horizon using height of eye?
1.17 (vheight of eye in feet)
What is the formula for hull speed (knots)?
1.34 (vLWL in feet)
What is the formula radar horizon?
1.22 (vheight of antenna in feet)
1 ton of bollard pull is considered to be equivalent to ______ shp?
You could have answered with any of the following: 1. 100
100 shp is considered to be ______ tons bollard pull?
You could have answered with any of the following: 1. 1 2. one
A cable (British) is equal to ______ Nautical Miles?
1/10 of a nautical mile.
30 knots of wind is equal in force to ______ knots of current
You could have answered with any of the following: 1. one 2. 1
1 knot of current is equal in force to ______ knots of wind
You could have answered with any of the following: 1. thirty 2. 30
The specific gravity of fresh water is ______.
You could have answered with any of the following: 1. 1.000
The specific gravity of salt water is ______.
You could have answered with any of the following: 1. 1.025
The density of salt water is ______ oz/ft3.
You could have answered with any of the following: 1. 1025
The density of fresh water is ______ oz/ft3.
You could have answered with any of the following: 1. 1000
One long ton of fresh water is equal to ______ ft3
You could have answered with any of the following: 1. 35
One long ton of salt water is equal to ______ ft3
You could have answered with any of the following: 1. 36
When moving from salt water to fresh water draft will increase by _____%. (excluding hydrostatic properties)
You could have answered with any of the following: 1. 2.5
Displacement varies with the ______ of the ship’s dimensions. 1. lineral change 2. square 3. cube 4. fourth power
Hooyer p. 9 The correct answer is: Number 3 cube
Wetted area varies with the ______ of the ship’s dimensions. 1. lineral change 2. square 3. cube 4. fourth power
Hooyer p. 9 The correct answer is: Number 2 square
Squat varies with the ______ of the ship’s speed. 1. lineral change 2. square 3. cube 4. fourth power
The correct answer is: Number 2 square
Power required varies with the ______ of the ship’s speed. 1. lineral change 2. square 3. cube 4. fourth power
The correct answer is: Number 3 cube
Resistance varies with the ______ of the ship’s speed. 1. lineral change 2. square 3. cube 4. fourth power
The correct answer is: Number 2 square
VHF Ch 16 = _____ Mhz
You could have answered with any of the following: 1. 156.800 2. 156.80 3. 156.8
VHF Ch 13 = _____ Mhz
You could have answered with any of the following: 1. 156.650 2. 156.65
VHF Ch 22a = _____ Mhz
You could have answered with any of the following: 1. 157.100 2. 157.10 3. 157.1
