PILOTAGE PRE-PLANNING GUIDE
13.3 Passing Drogden channel with tow, general information
Maximum draft through Drogden channel is 7.7 m static @ mean sea level leaving
UKC to be 0.3 m. The channel is 6 nm long stretching from Drogden lighthouse to
Nordre Roese lighthouse and it is 300 m wide. The official depth is 8 m. Density in
brackish waters is normally between 1,008 to 1,015. If your vessel has a draft of for
example 7.8 m and still wants to pass Drogden it is possible, but the water level has
to be +10 cm as Danpilot and the authorities at all times require minimum 0.3m.
If owners or charterers have different UKC policies which require more than 0.3 m
and this cannot be obtained by deballasting, the vessel will have to transit via the
If your vessel’s propeller is not fully submerged to obtain a certain draft, this will not
be an issue, as transit time is short and, according toexperience it only causes slight
vibration. Normally 15-25 cm of the propeller will be coming out of the water to
obtain a certain draft. You don’t have to trim if the water level is in our favor. After
the channel you can take in ballast again.
Speed in the channel is discussed and agreed between master and pilot when doing
the master/pilot exchange, but in general when your vessel has 6-7.3 m draft speed
will normally be around 9-10 knots, from 7.3-7.7 m speed will normally be 7-9
knots. Speeds mentioned are through the water.
When calculating squat, table for open waters should be used, as the channel is in
With respect to air draft, there is no restriction. However, it is mandatory to report
to Sound Traffic when entering the VTS area. They will then inform the airport tower
when you are passing the airport.
There is no obligation to use a tug. However, we recommend to use a tug aft for passage
of Drogden Channel from Drogden lighthouse to Nordre Røse lighthouse or
vice versa since we often have a strong current setting abeam on the Channel which
especially affects a tug and tow so compensation up to 25 degrees is sometimes necessary.
Contact http://svitzer.com/contact-us for prices on tug.
In this region they have mainly ASD tugs with 60 tons bollard pull so they are sufficient
for the job. Another thing to consider is the wind area which can also push