15. NAVIGATION TOOLS
15-11
15.8 UKC (Under Keel Clearance)
15.8.1 UKC overview
UKC is the distance between the deepest point of the vessel's hull and the seabed.
The Actual UKC feature continuously checks the ship's draught setting (UKC), and ac-
tual depth. When a look-ahead area is set and the depth within the set area gets shal-
lower than the UKC, the Alert 173 “UKC Limit” is generated. If the current depth is less
than the echo alarm setting the Alert 30801 “Depth Limit” also is generated. Depth
data is required to use the UKC and Echo Alarm functions.
UKC takes into account the amount of hull subsidence (Squat Effect). The evaluation
criteria for Alert 173 “UKC Limit” is not based solely on the distance from the keel to
the seabed, under keel clearance or draught.
Note 1: When conducting a route check, UKC is calculated based on the planned
speed for each leg.
Note 2: The sensor value shown is the depth to the transducer. Convert the value to
the distance to the keel.
Sea surface
Draft
Under keel clearance (UKC)
Seabed
Distance from keel
to seabed
Echo alarm setting
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