NAV 6

Question 1

What do depth contours represent in an ENC?

Answer 1

Lines connecting points of equal depth

Question 2

Depth contours assist mariners in:

Answer 2

Planning safe routes based on underwater topography

Question 3

How are depth contours displayed in ENGS?

Answer 3

Using color-coded zones

Question 4

What symbol is typically used to represent tidal currents in an ENC?

Answer 4

Arrows showing direction and strength

Question 5

Tidal current information is especially critical in:

Answer 5

Shallow waters and coastal navigation

Question 6

What are aids to navigation (AtoN)?

Answer 6

Buoys, beacons, and lights that guide navigation and mark hazards

Question 7

The main function of navigational aids in an ENC is to:

Answer 7

Mark hazards and provide positional reference points

Question 8

What characteristics of navigational aids are shown in an ENC?

Answer 8

light patterns, colors, and ranges

Question 9

Coastlines on an ENC are important for:

Answer 9

Coastal navigation and position referencing

Question 10

Which features are included in an ENC’s coastline data?

Answer 10

Ports, docks, and breakwaters

Question 11

How are landmarks displaved in an ENC?

Answer 11

As symbols representing their shape and height

Question 12

What kind of data on obstructions is typically found on an ENC?

Answer 12

Submerged rocks, wrecks, and underwater hazards

Question 13

The symbols for underwater obstructions in an ENC include:

Answer 13

Standardized symbols with depth information

Question 14

Why is hazard information critical for mariners?

Answer 14

To avoid running aground or colliding with underwater objects

Question 15

Traffic Separation Schemes (TSS) are designed to:

Answer 15

Ensure smooth traffic flow and reduce the risk of collision

Question 16

Shipping routes on an ENC are represented as

Answer 16

Defined lanes with directional markers

Question 17

In congested sea areas, why is TSS data important for navigation?

Answer 17

To avoid collisions and regulate ship movements

Question 18

Chart datum refers to:

Answer 18

The reference level for depth measurements

Question 19

Vertical clearances on an ENC are critical for:

Answer 19

Passing under bridges and overhead obstructions

Question 20

The height of vertical clearances is typically measured:

Answer 20

Above chart datum or water level

Question 21

Seabed composition data helps mariners:

Answer 21

Plan safe anchoring areas

Question 22

Why are marine protected zones marked on ENC?

Answer 22

To prevent vessel entry and protect sensitive environments

Question 23

How are restricted areas marked on an ENC?

Answer 23

Shaded zones with boundaries

Question 24

Tidal data in an ENC allows mariners to:

Answer 24

Plan routes in shallow waters

Question 25

How is tidal data integrated into an ECDIS system?

Answer 25

As real-time updates of water levels

Question 26

Why is it important to consider tidal variations when planning a route?

Answer 26

To ensure safe passage through shallow areas

Question 27

A vessel has a maximum static draft of 12 meters. What should the shallow contour be set at?

Answer 27

12 meters

Question 28

If a vessels maximum draft is 10 meters, company’s UKC policy is 1.5 meters, squat is 1 meter, and the height of tide is 2 meters, what is the salety depth?

Answer 28

Safety Depth = Max Draft (10) + UKC(1.5) + Squat (1) - Height of Tide (2) = 10.5 meters

Question 29

A vessel with a draft of 6 meters is sailing in an area where the depth is 24 meters. What would be an appropriate setting for the deep contour?

Answer 29

Deep Contour is usually estimated as twice or four times the vessel’s draft. Here, 24 meters is four times the draft of 6 meters.

Question 30

For a vessel with a maximum draft of 9 meters, the company’s UKC requirement is 2 meters, squat is 0.8 meters, and the height of tide is 1.5 meters What is the calculated safety depth?

Answer 30

Safety Depth = Max Draft (9) + UKC (2) + Squat (0.8) - Height of Tide (1.5) = 10.3 meters

Question 31

If the vessel’s speed is 12 knots and there is a following current of 2 knots. What is the expected SOG?

Answer 31

14 knots

Question 32

A vessel is navigating east (090°) with a southward (180°) current. What is the most likely impact on its course?

Answer 32

Drift to the south