Quiz 3

Question 1

What is a term used to describe bearing that is different by 180 degrees?

Answer 1

Reciprocal Bearing

Question 2

What is used to determine a visual or electronic fix by taking a bearing or range to a nav aid?

Answer 2

Line of Position

Question 3

What is the minimum number of LOPs needed for a Navy fix?

Answer 3

3

Question 4

In what order do you take LOPs from the ship when determining a fix as to have 90 degrees of separation?

Answer 4

Beam –> Bow –> Stern

Question 5

What type of fix is used when there is not enough nav aids to generate LOP?

Answer 5

Running Fix

Question 6

How to calculate the true bearing of another vessel

Answer 6

True Bearing = Relative Bearing + True Heading

Question 7

When a fix is labeled on a chart-
What does a triangle mean?
What does a half-circle mean?

Answer 7

Triangle= Electronic fix, range, GPS, composite
Half-Circle= Dead Reckoning

Question 8

What are the 6 rules of Dead Reckoning? (Short Response)

Answer 8

Plot a DR position
1. Every hour on the hour
2. Every course change
3. Every speed change
4. When obtaining a single line of position
5. When obtaining a fix or a running fix

6. Plot and label new course, speed, time, and DR out two fix intervals

Question 9

3 Minute Rule

Answer 9

Distance traveled (yards) = Speed (knots) / 100

Question 10

6 Minute Rule

Answer 10

Distance traveled(Nautical miles) = Speed(knots) / 10

Question 11

Describe how radar detects other surrounding ships and how far away they are from you (Short response)

Answer 11

Emits a Radio Wave that reflects off of all objects within its range. A computer system notes the angle at which the radio wave returns to find the bearing of the object. The same computer calculates the time between when the radio wave left the radar and when the radio wave returned and multiplies by the speed of light to determine range.

Question 12

How many GPS satellites are in orbit?

Answer 12

32

Question 13

Term for how satellites ping a location

Answer 13

Trilateration- A calculation that measures the distance
between satellites in orbit and the receivers on earth

Question 14

What term is when someone falsely masks as another ship?

Answer 14

Spoofing

Question 15

True or false- A figure of merit is an internal radar calculation that indicates the best accuracy achievable from the satellite being tracked

Answer 15

False- FOM is an internal GPS receiver calculation that indicates
the best accuracy achievable from the satellites being tracked