Clear space at sea for a ship to turn or manoeuvre in.
（能供船舶转弯或机动的）宽广海区
vessels are experiencing difficulty owing to lack of deep water and sea room
Example sentencesExamples
This strategy could be implemented in two ways, close and distant, which differed only in the amount of sea room they allowed the weaker side.
The range of the missile extended submarine operations to the Pacific Ocean, providing greater sea room and operating area.
In theory I am a sailor, but a coastal sailor, where we have what's rightly called ‘sea room.’
The simulation established that the new route is safer than the Inner Route, even though it has areas of restricted sea room, especially at the northern end.
Definition of sea room in US English:
sea room
noun
Clear space at sea for a ship to maneuver in.
（能供船舶转弯或机动的）宽广海区
vessels are experiencing difficulty owing to lack of deep water and sea room
Example sentencesExamples
The simulation established that the new route is safer than the Inner Route, even though it has areas of restricted sea room, especially at the northern end.
In theory I am a sailor, but a coastal sailor, where we have what's rightly called ‘sea room.’
This strategy could be implemented in two ways, close and distant, which differed only in the amount of sea room they allowed the weaker side.
The range of the missile extended submarine operations to the Pacific Ocean, providing greater sea room and operating area.