Electronic Navigation

Question 1

When using GPS you expect your position to be accurate what % of the time and to what distance?

Answer 1

95% of the time and to within a radius of 20m

Question 2

The highest level of navigational accuracy is provided by?

Answer 2

DGPS

Question 3

All echo-sounders measure the actual depth of the water below?

Answer 3

The keel

Question 4

What would you add to a fathometer to determine the depth of the water?

Answer 4

The draft of the vessel

Question 5

When operating over what type of bottom may a fathometer indicate two depth readings?

Answer 5

muddy bottom

Question 6

The signal transmitted by a radiobeacon station is called?

Answer 6

Its characteristic signal

Question 7

You area approaching a RACON, it may be identified on radar by?

Answer 7

A coded signal appearing on the same bearing at a greater range

Question 8

RACON?

Answer 8

radar transponder beacon

Question 9

In order to insure that a radio signal is displayed on your radar you should?

Answer 9

Turn off the interference controls on the radar

Question 10

What are some limitations of radar?

Answer 10

Max and min range settings, radar transmission being line of sight and mechanical or electrical failures