Mariner of the Seas 3M Ocean View Cabins
Cabin category 3M is an ocean view cabin on Mariner of the Seas: 16 3M cabins on decks 6, 8 and 9, each 211 sq ft.
Mariner of the Seas 3M ocean view floor plan
- Sleeps
- Up to 4 guests10 cabins sleep 2 · 6 sleep 4
- Beds
- One Royal King bed (can convert into two twin-size beds) · One double sofa bed in staterooms with up to 4 guests
- Bathroom
- One bathroom
- Living space
- Room with bed, vanity and sitting area with sofa
How Mariner of the Seas 3M cabins compare
Mariner of the Seas 3M ocean view cabins are the same 211 sq ft as 1 other ocean view category; 13% of its cabins connect to a neighbor.
3M: 211 sq ft · tied #3 with 1 other of 8 ocean view categories
Find Mariner of the Seas 3M cabins on the deck plan
Deck 9 · 8 3M cabins
Swipe to pan · tap a cabinHover a cabin · click to pinClosest alternatives to Mariner of the Seas 3M
Only what's different from 3M is shown.
Same size, on lower decks
More room inside
Similar size, on higher decks
Where 3M ocean view cabins sit on Mariner of the Seas
Most 3M cabins are forward: 75% of those with a recorded position. 3M cabins are on decks 6, 8 and 9; deck 9 has the most (8).
What's inside a Mariner of the Seas 3M ocean view cabin
On Mariner of the Seas, Spacious Ocean View staterooms (category 3M) measure 211 sq ft and sleep up to 4 guests. Beds: one Royal King bed that converts into two twin beds and one double sofa bed (in rooms for 4). Mariner of the Seas has 16 3M cabins, on decks 6, 8 and 9.
One bathroom. Room with bed, vanity and sitting area with sofa.
Included
- Dedicated stateroom attendant
- Daily cleaning service
- Exclusive bedding collection
- Stateroom climate control
- Ample closet and storage
- In-room HD-TV
- In-room safe for valuables
- Hair dryer
- Deluxe toiletries: shampoo, conditioner & body wash
Mariner of the Seas 3M cabin photos
All 16 cabins in category 3M
Deck 6
6 cabinsDeck 8
2 cabinsKnown issues in cabin category 3M
No issues recorded for 3M cabins.
Ocean View prices on Mariner of the Seas
Prices are by cabin type. We don't price individual categories like 3M; "See ocean view fares" opens current ocean view fares with our booking partner.
Ocean View is $15 more per night than an inside cabin, and $11 less per night than a balcony.
Fares as of Oct 9, 2026. Prices change daily.
61% of upcoming Ocean View sailings are currently below their recent average fare.
3M on other Royal Caribbean ships
Mariner of the Seas 3M cabin FAQ
How big is a Mariner of the Seas 3M ocean view cabin?
Every Mariner of the Seas 3M cabin is 211 sq ft.
How many Mariner of the Seas 3M cabins are there, and on which decks?
Mariner of the Seas has 16 3M cabins: 6 on deck 6, 2 on deck 8 and 8 on deck 9.
How many people can stay in a Mariner of the Seas 3M cabin?
Mariner of the Seas 3M cabins sleep up to four. 10 cabins sleep 2 and 6 sleep 4.
What's the difference between cabin category 3M and 4M on Mariner of the Seas?
Mariner of the Seas 3M and 4M cabins are the same size (211 sq ft in total). 4M cabins are on deck 7; 3M cabins are higher, on decks 6, 8 and 9.
Do Mariner of the Seas 3M cabins connect?
Yes: 2 of the 16 Mariner of the Seas 3M cabins (13%) connect to a neighboring cabin.