But there to protect the open sea lanes. Then it’s up to the ships captain to make the call and answer for it.
Now is 10 nations Navy coalition fleet there.
Generally, yes, ship master sends mayday call, when under attack.
During piracy crises in Aden, reporting was different, so they could implement other ways of reporting in this situation.
During Aden Piracy crisis (immediate post Captain Phillips time)
Voluntary reporting scheme was to send security information in advance to coalition fleet center, with ship details, spec, planned route, crew details and anti piracy internal contingency plan.
Coalition warships could be called any time.
Reporting of suspect pirate vessels to the coalition warships fleet, enforced.
There was an option to navigate in convoys under Navy escort.
Voluntary sailing in convoys formed based on vessels speed, at agreed time (8 kts. 10 kts, etc) under Navy escort.
It was known that slow speed vessels are high risk to be attacked. Majority of ships attacks was against tankers and bulkers up to 12 knots.
Pirats successful boarding on vessels up to 15 knots, attempts to board 18 knots.
Vessels over 18 kts, low risk.