A
B
D
C
The NM number in the current year which should be recorded at the bottom left hand corner
of the chart after you have updated the chart. An asterisk indicates that the notice is based
on original information.
The title includes the geographical area or country, a more specific region or port and the
nature of the update.
When the update affects a light and/or radio signal, the relevant Admiralty List of Lights
and/or Admiralty List of Radio Signals volume and the appropriate number will be shown.
The source of the information is shown under the title of the NM.
G
H
Occasionally an informative Note is included. These notes may be used to indicate such things
as a T or P NM being cancelled by the promulgation of that particular chart update, when other
charts affected by the source information will be updated in due course e.g. by block or NE, and
when the NM affects "Certain Copies only."
"Certain Copies only" means that some charts have already been corrected for information
contained in the Notice to Mariners. For whatever reason, it is important to know that you must
always write the number of the Notice to Mariners in the bottom left hand comer of the chart
even when your chart contains the information reported in the Notice to Mariners.
The NM individually lists each chart affected, showing the relevant part or parts of the
update which affect that chart.
The following points should be noted:
. Charts are listed in numerical order within each update.
. If the previous update information contained in the square brackets does not agree
with the information on your chart, you are missing one or more NMs or you are
using an old edition. You should always insert the missing NMs onto the chart before
updating the chart for the latest NM.
. The geodetic datum is shown alongside the chart number after "previous update". If
the notice affects a plan or inset, this is indicated. NB. Tracings should always be filed
by chat number. That way all the relevant information for any particular chart is kept
together and, ifthat chart is cancelled or replaced by a new edition or a new chart, all the
old tracings relating to that chart can be destroyed.
The text of the update comes next. Be careful when noting positions. Positions are normally
given in degrees, minutes and decimals of a minute, but may occasionally quote seconds for
convenience when plotting from the graduation of some charts.
In some cases, positions may be cross-referenced in this manner.