Zavisi da li je u pitanju ili sonarna kupola (sonar dome) ili radarska kupola (radar dome / radome).

Ako nema više podataka o tome, a ne možete da dobijete pojašnjenje od klijenta, možda je bolje ostaviti "((war)ship) dome".

"Sonar domes are located on the hulls of submarines and surface ships. Their purpose is to house electronic equipment used for detection, navigation, and ranging."
https://www.epa.gov/sites/default/files/2015-08/documents/20...

"A radome is a structural, weatherproof enclosure that protects a radar system or antenna and is constructed of material that minimally attenuates the electromagnetic signal transmitted or received by the antenna. [...] Radome Services LLC crews are experienced with all types, including dielectric, space frame, composite, and air inflatable radomes that are mounted on the ground, towers, roof tops and on board ships."
https://www.radomeservices.com/what-is-a-radome/