US Coast Guard (USCG) 47-foot Motor Lifeboat (MLB) (47268) breaks a wave  during a rescue at sea exercise off the coast of Yaquina Bay State Park,  Oregon (OR). Coast Guard personnel train

The 47-Foot motor Lifeboat is designed as a first response rescue resource for the Coast Guard in high seas, surf and heavy weather environments.

47-foot Motor Lifeboat - Wikipedia

They are built to withstand the most severe conditions at sea and are capable of effecting a rescue at sea even under the most difficult circumstances.

For those in distress, a Coast Guard 47 MLB is a welcome sight - The  Martha's Vineyard Times

They are self-bailing, self-righting, almost unsinkable, and have a long cruising radius for their size. It is the replacement for the aging 44′ MLB fleet.

47-Foot Motor Lifeboat - MLB | Military.com

There are (presently) 117 operational, being added to monthly.

DVIDS - Images - 47 foot motor lifeboat in Northwest Pacific Ocean -  bellezatotal.com.ar

The total (to be delivered over 5 years) will be about 200.

DVIDS - Images - National Motor Lifeboat School [Image 16 of 25]

Boating Skills At Their Best | BoatUS