Rule 19, Radar Plotting & ARPA

Question 1

Rule 19 applies to

Answer 1

All vessels NOT in sight of one another navigating in or near an area of RV.

Question 2

In Restricted Visibility, every vessel..

Answer 2

shall proceed at a safe speed adapted to the prevailing circumstances and conditions of restricted visibility.

Question 3

A vessel which detects by radar alone, the presence of another vessel….

Answer 3

shall determine if risk of collision exists.

If so, shall take avoiding action in ample time consisting of an alteration of course.

Question 4

The following SHALL BE AVOIDED when taking action with another vessel detected by radar alone…

Answer 4

1. An alteration of course to port for a vessel forward of the beam, other than for a vessel being overtaken.
2. An alteration of course towards a vessel abeam or abaft the beam.

Question 5

Except where it has been determined that a risk of collision does not exist…

Answer 5

Every vessel which hears a fog signal of another vessel forward of her beam, shall reduce her speed to the minimum at which she can be kept on her course.
If necessary, taking all way off and navigate with extreme caution until danger of collision is over.

Question 6

Who is the stand on vessel in Restricted Visibility?

Answer 6

There is no stand on vessel in RV.

Question 7

In restricted visibility, a power driven vessel shall..

Answer 7

have her engines ready for immediate manoeuvre.

Question 8

Rules which apply in Restricted Visibility

Answer 8

Rule 4 - 10 (Conduct of vessels in any state of visibility)

Rule 19 (Conduct of vessels in Restricted Visibility)

Rule 35 (Sound Signals in RV)

Question 9

Who has responsibility?

Answer 9

The OOW.

Companies have to ensure compliance of their crew with the COLREGs and issue guidance to that extent.

Question 10

Keeping a proper lookout requires..

Answer 10

The OOW to ensure that all available means are used to obtain and evaluate as much information as possible about the current traffic and navigation situation before taking action.

Question 11

MGN 379

Answer 11

Use of Electronic Navigational Aids

Question 12

MGN 369

Answer 12

Navigation practices relevant to Restricted Visibility

Question 13

To estimate risk of collision with another vessel..

Answer 13

the closest point of approach must be established. (CPA)

The avoiding action is dependent on knowledge of the other vessel’s track using manual or automatic plotting methods.

Question 14

Inaccurate compass headings or speed input will..

Answer 14

reduce the accuracy of true vectors when using ARPA or ATA.

Question 15

Good practice when two radars are fitted (mandatory for ships 3000GT and over)..

Answer 15

• one to be designated for anti collision work (ARPA)
• the other used to assist navigation.

Question 16

What is ARPA

Tonnage Requirements?

Answer 16

Automatic Radar Plotting Aid

Manual or automatic acquisition of targets and the automatic tracking and display of
information for at least 20 targets.

Also enables trial manoeuvres to be executed

(Ships 10000GT and over)

Question 17

EPA?

Tonnage Requirements?

Answer 17

Electronic Plotting Aid

electronic plotting of at least 10 targets

no automatic tracking

(Ships between 300 and 500GT)

Question 18

ATA?

Tonnage Requirements?

Answer 18

Automatic Tracking Aid

manual acquisition and automatic tracking and display of at least 10 targets

(Ships over 500GT)

Question 19

Requirements for Ships 3000GT and over

Answer 19

the second radar must also be equipped with an ATA, the two ATAs must function independently of each other.

Question 20

Manual plotting equipment?

Answer 20

No longer acceptable except for existing vessels complying with SOLAS V/74

Question 21

Is the observed and predicted relative motion of a target affected by choice of sea or ground stabilisation?

Answer 21

No, but be aware of the time required for the radar equipment to reprocess the stabilisation input data.