Electronic charts and nautical marine chart software - Navigation Dynamics   Electronic charts and nautical marine chart software - Navigation Dynamics
Electronic Charts for the World.

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.

Tsunamis 99 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 Torres Strait image below, assuming the vessel has a draft of 4.2 meters. The chart depth at Hovel Bar is 3.2m. 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
DEPTH AT HOVEL BAR 3.2 m
TIDE REQUIRED 1.5 m

It is the TIDE REQUIRED of 1.5 m that the level line is set to in the tide function by the operator. This will produce a graph showing the times of sufficient tide. Tide information can be accessed through TASK on main menu while running the Nav program. Tidal information can also be run full screen through Programs - Tsunamis - Tides.

Click on the image below to see the tide graph for the above example.

Thursday Island (Torres Strait, Australia)

Thursday Island (Torres Strait, Australia) - Tide Graph

The image below is another example of the tide function. This tide graph is of Pittwater, in northern Sydney.

Pittwater (North of Sydney, Australia)

Pittwater (North of Sydney, Australia) - Tide Graph

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