102 NAVIGATION FUNDAMENTALS Flashcards
Describe the effects of SEA, WIND and Current on small boats
can make the small boats go off course
How does CAVITATION affects small boat handeling?
Propeller draws in an air water mixture causing LOSS of EFFECTIVE THRUST and propeller EFFICIENCY
what is IALA systems A and B?
- International Association of Lighthouse Authorities.
- Standard system of Buoys used around the world
- A = Asia, Africa, Europe (green right returning)
- B = The Americas and Japan (red right returning)
what is High Tide?
MAX water height from the RISING tide
What is Low Tide
MIN water height from the OUTGOING tide
What actions should be taken by the Give Way and Stand-On vessels in a OVERTAKING situation?
- Stand on Vessel must keep out of the way of the vessel being overtaken
- Give way vessel can’t turn and cause crossing situation
Define Mean High Water
Average height of all HIGH-Tide water levels, measured over a 19-year period
Define Mean Low Water
Average height of all LOW-tide levels, observed over a 19-year period
Define Spring Tide
Tides that occur when SUN AND MOON IN LINE WITH EARTH, causes HIGH tides to be HIGHER and LOW tides to be LOWER
Define Compass Bearing
The direction you are headed, as shown by a compass
Define Fix
Known Point on Earth
Define Relative Bearing
Direction from the boats bow at 000⁰, measured clockwise through 360⁰
Define Dead Reckoning
The process of calculating one’s position, by estimating the direction and distance rather than using wind, sea conditions and sea current
How do you determine a safe speed in a STATE OF VISIBILITY
as visibility decreases, boat speed should also decrease
How do you determine a safe speed in a TRAFFIC DENSITY
Alot of traffic density requires slower speed to avoid collision
