The activities also include studies of tides and currents and publishing tide tables.
Tide tables list each day's high and low water heights and times.
These almanacs contained phases of the moon, tide tables, best times to plant, and the setting of religious holidays.
They also provide weather forecasts, tide tables and other important sailing information.
Consequently, all navigators use tide tables either in a booklet or on a computer.
Tide tables are needed as parts of the trail are impassable at high tide.
Tide tables give the height of the tide above a chart datum.
In a document giving tide tables the time used is specified, and to insert "by statutory instrument" would destroy the flexibility of the clause as drafted.
