The radio operator reported one moving at 138 knots which is approx 160mph. The DRL RacerX has recorded speeds over 163.5 mp getting a guiness world record, although this was indoors.
That's an indoor speed record for a quadcopter. If you're designing a drone system for maritime operation it would make far more sense to be fixed wing (maybe with some sort of VTOL or STOL capability) - the efficiencies are just so much higher.
The military has been using drones since before quad copters. Anything long range is not going to be a quad, but something like a small plane. I'd imagine 'drone' in military lingo still mostly refers to fixed wing craft.
Once you go to fixed wing, 138 knots is pretty simple. Just look at the list of unmanned aerial vehicles - it's big and dominated by fixed wing aircraft. https://en.wikipedia.org/wiki/List_of_unmanned_aerial_vehicl...