Radar Plotting Flashcards
What is a radar plot?
A radar plot is an observation of target to obtain CPA, TCPA, Course, Speed and aspect from another vessel.
How many plots do you need for a radar plot?
At minimum three, this is because risk of collision shall not be based on scanty information, especially scanty radar information. (Rule 7 - C)
How do you get the CPA of a target?
You extend the O-A line and measure at a right angle from own ships position.
What does O stand for on a radar plot?
It stands for the original position of a target
What does A stand for on a radar plot?
It stands for the actual position of a target
What does W stand for on a radar plot?
It is your vessels position in relation to the target
What is the O-A line on a radar plot?
This is the way of another, meaning the target.
What is the W-A line on a radar plot?
This is way of own, meaning your vessel
What does CPA stand for?
It stands for Closest Point of Approach
What does doe TCPA stand for?
It stands for Time of Closest Point of Approach
