From 1 ¹/2 hours before until 4 hours after high water a westerly stream runs across the harbour entrance. The easterly stream begins 1 ¹ /2 hours before low water and continues until 2 hours before high water. These flows are in evidence a little earlier as the shore is closed.

At spring tides the mean height above chart datum of high water is 5.6 metres and of low water 0.7 metres. During neap tides the mean height above chart datum of high water is 4.5 metres and of low water 1.5 metres.

The level of Littlehampton bar which extends 600 metres southwards from the end of the West Pier is 0.8 metres above chart datum. The depth of water covering the bar can thus be calculated by subtracting 0.8 metres from the height of water indicated on the tide boards situated within the harbour. Tide boards are metric, marked in units of 20 centimetres and coloured white, red, black, red, black. When approaching the harbour the tide board on the West Pierhead can be read from sea with the use of binoculars. Consideration should be given to the sea state and allowance made for swell over the bar.

On closing the harbour from seawards, a safe approach can be made by bringing the leading lights into line on a bearing of 346^o True.

From abeam the West Pierhead a course favouring the east side of the fairway should be made to allow for the westerly set.

Once past the East Pierhead, keep the flashing green light on Fisherman’s Quay ahead while keeping to the starboard side of the channel.

During spring tides, if approaching the harbour by night, it is wise to plan arrival within 3 hours either side of high water. Tide tables are available from the Harbour Office.