HSTK H Admiralty

CD

Chart Datum - Datum for sounding reduction

LAT

Lowest Astronomical Tide

HAT

Highest Astronomical Tide

MLW

Mean Low Water

MHW

Mean High Water

MSL

Mean Sea Level

MLWS

Mean Low Water Springs

MHWS

Mean High Water Springs

MLWN

Mean Low Water Neaps

MHWN

Mean High Water Neaps

MLLW

Mean Lower Low Water

MHHW

Mean Higher High Water

MHLW

Mean Higher Low Water

MLHW

Mean Lower High Water

Sp

Spring tide

Np

Neap tide

Flood tide stream (with mean spring rate)

Ebb tide stream (with mean spring rate)

Current in restricted waters

Ocean current. Details of current strength and seasonal variations may be shown.

Overfalls, tide rips, races

Eddies

Position of tabulated tidal stream data with designation

Offshore position for which tidal levels are tabulated