Tides

Tidal Information

Simply choose a date and and port, enter the required tide height and the tidal curve will appear. The tide line will appear showing the times and when sufficient tide is available.

Navigator Tide Function and Under Keel Clearance

Apart from providing tidal height information for Standard and Secondary Ports around the world this function can also provide useful information on Under Keel Clearance (UKC). UKC is the amount of water under the keel at a given draft, time and place.

How to Calculate Tide Required

Use the Cairns example below, assuming the vessel has a draft of 4.2 meters. The minimum CHARTED depth while transiting SMITHS CREEK will be 3.5m. The minimum amount of water required between the keel and the sea floor (UKC) is 0.5m. To find the tide required, the following calculation is made.

DRAFT	4.2 m
UKC REQUIRED	0.5 m
DEPTH REQUIRED	4.7 m
MINIMUM DEPTH IN SMITH CREEK	3.5 m
TIDE REQUIRED	1.2 m

It is the TIDE REQUIRED of 1.2 m that the level line is set to by the operator. This will produce a graph showing the times of sufficient tide in blue and times of insufficient tide in red. Click on the image below to see the tide graph for the above example.

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