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