Hi,
It's one of a number contracted to the French navy for rescue, salvage and pollution work - same as the UK Coastguard tugs really. Dubious honour of having towed the Napoli.
The Bourbon is based out of Brest, with the Libertie based out of Cherbourg. Our predecessor, the Flandre, is now based out of Toulouse.
Superb ship in every way! Norwegian built though, that upset the French