Passage planning on an ECDIS

Question 1

What is a safety contour?

Answer 1

A specific depth contour, user-set on ECDIS. It demarks the boundary between safe water and shallow water with an extra wide Isoline.

It will alarm if the ship, within a time specified by the mariner, is going to cross the contour

Question 2

How do we set the Safety Contour, as seen in NP100 and the BPG 2022?

Answer 2

Draft, + UKC + allowance for sqaut/heel + Safety margin, Minus the HOT

Question 3

What is a Safety Depth?

Answer 3

A value set by the mariner that Darkens any depth that is less than the depth. Often set to the same as the Safety Contour

Question 4

Which MGN gives guidance on the use of risk assessment methodology when operating ECDIS in RCDS mode?

Answer 4

MGN 285

Question 5

What is one of the main benefits of ECDIS with regards to a passage plan route?

Answer 5

Route check, with user set safety margins denoting the alarms and indications along the passage, prior to monitoring.

The OOW should still check the route visually, in 1:1 compilation scale, and have it approved by the master before monitoring.

Question 5

CATZOC A1 parameters: 6 stars

Answer 5

Position accuracy: 5m
Depth accuracy: 0.5m + 1% depth

Question 6

CATZOC A2 parameters: 5 stars

Answer 6

Position accuracy: 20m
Depth accuracy: 1m +2% depth

Question 7

CATZOC B parameters: 4 stars

Answer 7

Position accuracy: 50m
Depth accuracy: 1m + 2% depth

Question 8

CATZOC C parameters: 3 stars

Answer 8

Position accuracy: 500m
Depth accuracy: 2m + 5% depth

Question 9

CATZOC D parameters: 2 stars

Answer 9

Position accuracy: More than 500m
Depth accuracy: More than 2m + 5% depth

Question 10

CATZOC U parameters: U

Answer 10

Position accuracy: Not Assessed
Depth accuracy: Not assessed