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

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

Question 11

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

Answer 11

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.