Jet suit developer Gravity Industries has joined forces with Britain's Royal Marines to test how their product can assist in Maritime Boarding Operations.

The company said their team spent three days with 42 Commando Royal Marines from HMS Tamar off the south coast of England.

A video handout out from Gravity Industries showed a Maritime Boarding Operation exercise with a fast rib boat coming alongside a moving high-sided ship, and hooking a caving ladder to permit assaulting personnel access.

Without the jet suit, the only alternative is using a helicopter and fast roping one at a time. Both methods are slow and vulnerable.

But a Royal Marine wearing the jet suit flies over the boats and lands on the ship, ahead of everyone else.

"The vision with the Jet Suit is to provide extremely rapid access to any part of the target vessel, instantly freeing up hands to bear a weapon, and even retaining the capability to relocate on target or self-exfiltrate," the company said in a news release.

"This is increasingly seen as a revolution in tactical capability for many special forces and has much broader application beyond Maritime boarding."

The jet suit has previously been tested by paramedics in England's remote, rugged Lake District region to get them to people in danger or distress in a fraction of the time it would take to travel by car or on foot.