The notices in Section II give instructions for the updating of standard nautical charts and selected thematic charts in the
ADMIRALTY series. Geographical positions refer to the horizontal datum of the current edition of each affected chart
which is stated in the notice alongside the appropriate chart number. 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 older-
style charts. Where Leisure Products are referred to different horizontal datums from the standard nautical charts for that
geographical area, positions in the notices cannot be plotted directly on these products. Bearings are true reckoned clockwise
from 000° to 359°; those relating to lights are from seaward. Symbols referred to are those shown in NP5011. Depths and
heights are given in metres or fathoms and/or feet as appropriate for the chart being updated (abbreviated where necessary to
m, fm and ft respectively). Blocks and notes accompanying notices in Section II are placed towards the end of the section.