15. NAVIGATION TOOLS
15-7
15.7 UKC (Under Keel Clearance)
15.7.1 UKC overview
The UKC is the distance between the deepest point of the vessel's hull and the sea-
bed. The UKC feature continuously checks ship's draught setting (UKC), and actual
depth. When the depth gets shallower than the UKC, the Alert 634 "UKC Limit" is gen-
erated. And if the current depth is less than the echo alarm setting the echo alarm also
is generated. Depth data is required to use the UKC function.
Note: The sensor value shown is the depth to the transducer. Convert the value to the
distance to the keel.
15.7.2 How to set UKC
1. Select the [UKC] page from the [Overlay/NAV
Tools] box.
2. Use [Echo Alarm Limit] to set the distance for
the echo alarm. To activate the alarm, click the
[ON/OFF] button to show [ON].
3. At [UKC Limit], set ship's UKC limit. To activate
the UKC feature, click the [ON/OFF] button to
show [ON].
4. Use [Current Draught] to set your ship's draft.
Be sure to change the setting whenever the
draft changes.
5. Use [Type] to set the shape of your ship's hull
to show on the [UKC] window, [V-shape] or [Concave]. See the figure on the next
page.
Sea surface
Draft
Under keel clearance (UKC)
Seabed
Distance from keel
to seabed
Echo alarm setting
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