EquipmentsNotice to Mariners and Tracing Admiralty Notices 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 ready available in our office.Chart Correction Tracing The tracing is simply placed in the appropriate place on the chart to be corrected.The information to be inserted is usually enclosed by a firm line and arrowed to a small circle,indicating the exact position of the correction.This position is then marked on the chart through the tracing by use of a sharp pencil or compass point and the information transferred to the chart. Full instructions for use are given with each weekly set or tracings. 
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