RADAR PLOTTING

Question 1

How to convert from Tenths to Seconds?
37’14.37’N
076’29.95’W

Answer 1

Multiply .37 X 60 = 22 seconds

Multiply .95 x 60 = 57 seconds

Question 2

How to convert from Seconds to Tenths?
37’14”22 N
076’14’57” W

Answer 2

Divide 22/60 = .37

Divide 57/60 = .95

Question 3

What is Correcting demonstrating?

Answer 3

Changing from a Compass to a True Course

CDMVT+E -W

Question 4

What is UN-Correcting demonstrating?

Answer 4

Changing from a True - Compass course

TVMDC+W -E

Question 5

1° or 60” minutes = ?

Answer 5

60 Nautical Miles

Question 6

1’ or 60” seconds of latitude = ?

Answer 6

1 Nautical mile

Question 7

1 nautical mile = ?

Answer 7

2000 YARDS

Question 8

.1 nautical mile = ?

Answer 8

200 Yards

Question 9

What is the three min rule?

Answer 9

Distance traveled in yards in three minutes divided by 100 = the speed traveled
2700/100 = 27 kts or 27x 100 = 2700 yards

Question 10

What is the Six minute Rule?

Answer 10

Distance traveled in 6 minutes X by 10 = speed traveled
you traveled 1.2 nm in 6 min ?
1.2 x 10 =12 kts

Question 11

What is a turn bearing?

Answer 11

is a range and bearing off a fixed charted object used to mark a turn

Question 12

What is RML?

Answer 12

relative motion line- direction of the line of relative motion expressed in degrees true

Question 13

What is DRM?

Answer 13

Direction of relative motion

Question 14

What is CPA?

Answer 14

Closest point of approach

Question 15

What is SRM?

Answer 15

Speed of Relative motion- contacts speed relative to own ships motion.

Question 16

What are the eight aspects of a vessel?

Answer 16

BOW
port bow
stbd bow
stbd beam
port beam
port quarter
stbd quarter
dead astern

Question 17

What is True motion?

Answer 17

The Movement of an object with respect to the surface of the earth.
EX:
you are on a course of 000T, speed 10 kts, passing by a fishing pier extending from the beach down your port side.

Question 18

What is Relative motion?

Answer 18

The apparent movement of an object with respect to another moving object.
Example:
You are cruising down the freeway doing 70 mph and a car pulls up next to you. Is that car moving? Does it look like they are moving? Why, because they are doing the same “course” and speed that you are.

Question 19

What is True Vs Relative bearing?

Answer 19

True bearings: Direction measured with respect to true geographic north.

Question 20

What is Relative bearing vs True?

Answer 20

Direction measured in degrees from own ship’s heading(course) clockwise to the observed object.

Question 21

What formula do you use to convert relative bearing to True bearing ?

Answer 21

True bearing = Ship’s heading + Relative Bearing

Ex: Contact bears 090°R, ship is on course 045° T. What is True bearing 90 + 45 = 135 T

Question 22

When your using a MO-Board, and something is pointing towards your center location, this indicated what?

Answer 22

CBDR when in Relative Mode