NTM's & Tracings

Thomas Gunn Navigation Services Ltd currently supply a large number of shipowner and ship managers with a regular notice to mariner and tracings service. These updates are available weekly but dispatched on an agreed frequency using the preferred carriage method as specified by the customer.

Admiralty Notice to Mariners

Admiralty Notices to Mariners are issued as a weekly booklet by the UK Hydrographic Office and give details of all corrections to the Admiralty worldwide series of charts and publications as well as reprints of navigational warnings. These weekly Notices to Mariners are readily available from our office.

The UKHO's searchable NMs database, known as NM Websearch, allows users to to search by Chart number for NM Text, Full Colour Blocks and Notes. - To use NM Websearch, click here, or go to: www.nmwebsearch.com.

In addition to the Admiralty Notices, we also stock US Notices to mariners issued by the Defense Mapping Agency.

Chart Correction Tracings

This is an aid to the navigator or chart corrector for the correction of British Admiralty charts. They are issued weekly with corresponding Notices to Mariners and may be despatched either direct, or to your office for onward routeing to the vessel. Alternatively for customers of the new edition service the goods can be held in our office for inclusion in consignments containing charts and publications.

Since 2001, Thomas Gunn Navigation Services Ltd have been granted full approval of the Executive Council of the Chart and Nautical Instrument Trade Association to re-produce weekly tracing wallets for resale to its members and to Shipowners and Ship Managers.

Although tracings have been in use by the Royal Navy and Admiralty Chart Agents for many years, it was the Chart Committee of the Chart and Nautical Instrument Trade Association that successfully negotiated with the Hydrographer of the Navy for them to become available to the merchant marine navigator and private user.

The CNITA tracing overlay correction service is available from all Admiralty Chart Agents who are members of the Association, and is now supplied to more than 5,000 vessels worldwide, each week. Navigating Officers welcome the tracings system for its accuracy and speed. Onboard chart correction time can be cut by 80% and Masters can now rest assured that their charts are kept continually up to date.

We are also able to provide chart correction tracings for US charts. As with the Admiralty Chart Tracings these are supplied with accompanying Notices to Mariners.