Sunday 5 June 2022

General

How often do cumulative list: notices to mariners get published?
They are published bi-annually. The cumulative list is published in Jan and July.

What sort of information must you ensure is on the chart?
At a more general level you can ask, how would you go about planning a passage for the coastal area on a chart?
Passage planning is put into place by the IMO resolution A.893.
This puts into place regulation 34 of SOLAS V. The requirement for planning a safe passage of the vessel.
It has four distinct phases:
1. The appraisal. Here you must appraise and collate all of the relevant information.
Then plan the intended passage.
Then execute the intended passage.

Under pilotage navigation is going to be conducted using visual marks to ensure the ship remains in safe water. So you will need to put plenty of information on the chart to ensure you can visually monitor the vessels track along her pre-planned track.
Rule 5 and rule 9 are very important here so you must know rule 9 by heart.

The intervals for fixing the ships position:
It should take place at intervals that are no more than half the interval to the nearest danger.
So if the nearest danger is 10.0M away then fixing should be done every 5.0M

What if there are very few conspicuous visual marks or if you are navigating in an area of restricted visibility or if you are navigating at night?
Then ship borne radar techniques must be used
or shore based radar facilities must be used.
So what information must you ensure you put onto the chart?
Especially during pilotage or during the coastal stage of the voyage but you must ensure that it is properly planned.

How else can you monitor the vessels track?
Clearing bearings are essential information that you should plot on the chart.
These ensure the vessel stays on a safe approach.
So to monitor a safe approach you can use clearing bearings.

The best way to approach this question is to ask yourself: How would you plan the coastal part of a passage plan.
 NP 131
The admiralty chart catalogue.
This will help you select the large scale charts you need to plan the passage

For small scale charts please see: The world general charts of oceans.

From the admiralty chart catalogue you can draw a route through the area you are to navigate and this will give you the larger scale charts you need.
So:
1. Choose the appropriate scale of chart for use. The larger scale chart.
Although a smaller scale chart may be better to help you make sense of the buoyage system in place.
NGA This is the next thing that should be established.


With this calculated we have a means by which we can keep the vessel clear of shoal water.

The primary means of position fixing under pilotage should be visual.

PI's
CB
The echo sounder.
RADAR
3 point fixes
VSA
HSA
transits.
RF
CB: Between these two parameters the ship is safe.
As long as the conspicuous object is kept at a bearing between these two bearings then the ship would be safe.
sectored lights and transits.
Position fixing should be done at regular intervals, using more than one source.

Once you have the charts you need the navigation officer can now use the chart correction log folio index (NP 133A)
to check their edition numbers and see if any required corrections are needed.
Not having the appropriate large scale charts for any voyage is not acceptable. So, if you don't have them then they must be requisitioned.
So what must be marked on the chart?
Before we can plot a safe route on the chart we must mark the areas that we can't go:
Areas of danger.
This depends on the vessels UKC.
From this we have a NGA.

We can also set our safety parameters and the ships guard zone.

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