Navigation Flashcards
Which projection for nautical charts is the most commonly used and shows the earth on cylindrical planes using meridians and parallels? (NAVEDTRA 14308A) [OS3]
Mercator
Which projection for nautical charts preserves the natural curvature of the meridians and parallels, but are not commonly used, such as polar charts? (NAVEDTRA 14308A) [OS3]
Gnomonic
What lines on a chart run North and South? (NAVEDTRA 14308A) [OS3]
Meridian
What lines on a chart run East and West? (NAVEDTRA 14308A) [OS3]
Parallel
How many meridians are on a charting grid? (NAVEDTRA 14308A) [OS3]
360
The line which passes through Greenwich, England which divide the eastern and western hemispheres is known as the _____. (NAVEDTRA 14308A) [OS3]
Prime Meridian
What is the reference for parallels and dividing the northern and southern hemispheres? (NAVEDTRA 14308A) [OS3]
Equator
What is the angular distance in degrees, minutes, and seconds of are north and south of the equator? (NAVEDTRA 14308A) [OS3]
Latitude
What is the angular distance in degrees, minutes, and seconds of arc east or west of the meridian? (NAVEDTRA 14308A) [OS3]
Longitude
1 degree of latitude is considered to be _____ in length. (NAVEDTRA 14308A) [OS3]
60 miles
Charts that have a scale of 1:150,000 to 1:600,000 are ______. (NAVEDTRA 14308A) [OS3]
General Charts
Charts that have a larger that 1:50,000 are _______. (NAVEDTRA 14308A) [OS3]
Harbor Charts
Charts that 1:600,000 or small are ______.(NAVEDTRA 14308A) [OS3]
Sailing Charts
Charts with a scale between 1:50,000 to 1:150,000 are _____. (NAVEDTRA 14308A) [OS3]
`Coastal Charts
Interpret the following: “FL R 10s 55ft 12M HORN” (NAVEDTRA 14308A) [OS3]
Flashing Red, 10 secs, 55 ft. height above mean high water, 12NM visible, Horn sound signal
What is the formula for calculating distance? (NAVEDTRA 14308A) [OS3]
Distance (d) = Speed (s) X Time (t)
What is the three minute rule? (NAVEDTRA 14308A) [OS3]
- Divide by 100: (if d=800yds, t=3 mins, then s=8 kts)
- Multiply by 100 (if s=8kts, t=3 mins, then d=800yds)
- Note, use rule in yards
What is the 6-minute rule? (NAVEDTRA 14308A) [OS3]
- Divide by 10 (if s=8kts, t=6mins, then d=.8 NM)
- Multiply by 10 (if d=.8 NM, t=6mins, then s=8 kts)
- Note, must convert yards to NM to use
On a nautical chart, what color identifies shoal water? (Chart No. 1) [OS3]
Light Blue
On a nautical chart, what is the symbol and abbreviation for lighthouse? (Chart No. 1) [OS3]
Dot with “Lt Ho”
On a nautical chart, what is the symbol used to identify obstructions, wrecks, or reefs? (Chart No. 1) [OS3]
Dashed or dotted lines around the “Obstn”, “wk” or “reef”
Which system utilized aids-to-navigation with red buoys on the starboard side? (Chart No. 1) [OS3]
IALA B
What symbol is used for a visual or celestial fix? (NAVEDTRA 14308A) [OS3]
Circle
What symbol is used for an electronic fix? (NAVEDTRA 14308A) [OS3]
Triangle
