I laugh at 'security issues', I really do! But every person in authority must get to feel like hitler/mussolini/bush/blair/khan etc etc
Do they think terrorists don't already have access to all the info they need if they are planning something for a ship? Access to engineering schematics showing weak points of the hull below the water line should be restricted of course (they aren't, just consult google).
It's different in an aircraft where a madman wrestling the controls could crash a plane- but is it likely in a ship?
A good comparison. Here in Grot Britain (and most other countries) it was a criminal offence during the cold war to take photos of Navy ships in Portsmouth... Until the pea brains concerned realised it was pointless as the Russians already knew what they looked like
QED.