Relaxation bow height (10-46)
Under regulation 39.3 of the International Convention on Load Lines, 1966 and the 1988 Protocol thereto, the following relaxations of the bow height are permitted for vessels with a national safety certificate.
For these vessels, including pontoons in the condition ‘manned working’, a reduced bow height is allowed under restrictions in
- Sailing area (for the definitions see footnote, to be included on the (exemption) certificate)
- Maximum significant wave height
According to the table below.
Matching max significant wave height
Permissible reduced bow height1
< 15 miles2
< 4.0 m.
< 15 miles3
< 2.0 m.
In the past NSI has granted to some vessels a reduction in bow height, based on maximum wind force according to the table hereunder:
Max wind force in Beaufort
Permissible reduced bow height
< 15 miles
< 5 miles
For existing cases this practice can be continued.
1 Permissible reduced bow height
In percentage of the bow height calculated according to ICLL reg. 39.1 and 39.2.
2 Sailing area 15 miles
Coastal waters whereby the offshore distance does not exceed 15 nautical miles and the sailing time from safe harbor or anchorage shall be within 6 hours.
3 Sailing area 5 miles
Coastal waters whereby the offshore distance does not exceed 5 nautical miles and the sailing time from the port of operation, mentioned on the safe manning certificate, shall be within 12 hours and shall not be more than 6 hours from a port of refuge.