Notice to Mariners and Chart Correcting

Question 1

List the sections in the Weekly edition of the Admiralty Notice to Mariners

Answer 1

• I. Explanatory Notes. Publications List
• II. Updates to Standard Nautical Charts
• III. Reprints of NAVAREA I Navigational Warnings
• IV. Updates to Admiralty Sailing Directions
• V. Updates to Admiralty List of Lights and Fog signals
• VI. Updates to Admiralty list of Radio signals
• VII. Updates to Miscellaneous Admiralty Nautical Publications
• VII. Updates to Admiralty Digital Services

Question 2

Describe the procedure for correcting a chart up to date, once the weekly notices have been received.

Answer 2

• Check the publications list for charts affected
• Locate the chart correction in section II
• Check the chart edition onboard is the latest and that the last small correction has been done.
• Do the correction on the chart (with tracing aid if available)
• Record the small correction at the bottom of the chart.
• Record the correction in the correction log

Question 3

How long do temporary NTMs typically last for?

Answer 3

3-6 months

Question 4

How often are Cumulative lists of NTMs published, and what are they used for?

Answer 4

Every 6 months in January and July, to identify outstanding NTMs and to provide an audit trail for chart and publication corrections.

Question 5

Why are preliminary notices published?

Answer 5

They are used to give advanced notice of changes affecting navigation that will take place soon.

Question 6

Where would you find a summary of the T’s & P’s still in force at the start of the year?

Answer 6

The Annual Summary of Notice to Mariners (NP247)

Question 7

What are Notices to Mariners?

Answer 7

Advise seafarers of important changes to charts and publications. They contain all corrections, alterations and amendments for the UKHO’s charts and publications and are published in three different formats : weekly, annually and cumulatively.

Question 8

List 5 chart correcting actions

Answer 8

1. AMEND existing information (e.g. light characteristics changed)
2. INSERT new information (e.g. a new buoy)
3. SUBSTITUTE one feature for another in the same position (e.g. changed depth)
4. MOVE a feature (e.g. buoy repositioned)
5. DELETE feature (e.g. wreck that has been permanently removed)