Theory 2

Question 1

Not a characteristic of Raster charts?

Answer 1

Attribute tables linked to chart features

Question 2

5 mandatory alarms?

Answer 2

• crossing safety contour
• deviation from route
• positioning failure
• approach to critical point
• different geodetic datum

Question 3

What is data source for raster charts?

Answer 3

Paper charts that are scanned into digital format

Question 4

How accurate is ECDIS?

Answer 4

Accuracy that meets or exceeds the accuracy of associated paper charts

Question 5

Ecdis should be capable of identifying discrepancies between what two systems?

Answer 5

Any two positioning system methods available to ECDIS.

Question 6

When using gps for positioning system, the SENC and GPS should be referencing the same….?

Answer 6

Geodetic datum

Question 7

The responsibility of compiling accurate survey data, distribution data to users, and production of updates lies with?

Answer 7

The official hydrographic agency for particular region

Question 8

What’s the greatest problem in datum mismatches?

Answer 8

They have potential to be catastrophic.

Question 9

A chart object removed from SENC will?

Answer 9

Remain in the ENC

Question 10

Which statement is true regarding raster data sets?

Answer 10

Produced by scanning hard copy (paper charts) images and are composed of pixels.

Question 11

Display showing two motion vectors for own ship, one offset by several degrees from the other means?

Answer 11

One vector shows ships heading while other ships course over ground.

Question 12

How many satellites are included in gps system ?

Answer 12

24 in low level earth orbits

Question 13

Datum is?

Answer 13

A base reference point for measurements.

Question 14

Which is a required feature for route planning?

Answer 14

Ability to access info from official publications

Question 15

SENC does not include what?

Answer 15

Raster charts

Question 16

Which display can you not remove info from?

Answer 16

Display base

Question 17

Does manual updates affect the display ?

Answer 17

No

Question 18

Can radar and arpa info be imported to display?

Answer 18

Yes

Question 19

Which alarm is required for route monitoring?

Answer 19

When the scale in use is the largest scale supported by enc data format

Question 20

What’s a periodic update?

Answer 20

An update that is required at the end of each voyage lasting greater than one week

Question 21

And ECDIS display base is described as?

Answer 21

SENC info which is considered essential and cannot be removed from the display

Question 22

Displayed scale is described as?

Answer 22

The ratio between a distance on the display and the real world distance it refers to

Question 23

Ground stabiliser?

Answer 23

Owns ship motion referencing the coordinates of the earth.

Question 24

A record is?

Answer 24

An entry in database that refers to all info on the associated row of the entry

Question 25

True distance refers to?

Answer 25

Actual geographic distance considering reference datum

Question 26

Description of SENC ?

Answer 26

A database resulting from the transformation of the ENC by ECDIS for appropriate use

Question 27

What happens when a position fixing is lost?

Answer 27

ECDIS will provide indication

Question 28

How are performance tests conducted during or prior to a voyage?

Answer 28

Either through automatic or manually activated functions