Before revision: A submarine at periscope depth risks visual or radar detection Submarines can raise various antenna masts, radar masts and periscopes to facilitate communications and navigation Navigational technologies Surfaced submarines entering and leaving port navigate similarly to traditional ships but with a few extra considerations because most of the ship rides below the waterline, making them hard for other ships to see and identify.
After revision: A submarine at periscope depth risks visual or radar detection Submarines can raise various antenna masts, radar masts and periscopes to facilitate communications and navigation Navigational technologies Surfaced submarines entering and leaving port navigate similarly to traditional boats but with a few extra considerations because most of the ship rides below the waterline, making them hard for other ships to see and identify.