Side-by-side cruise ship comparison · Updated January 2026
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across 5 categories
Size
Based on gross tonnage and length
Capacity
Based on passengers and crew
Modernity
Based on year built
Service
Based on passenger-to-crew ratio (lower is better)
Spaciousness
Based on gross tonnage per passenger (higher is better)
Ocean Adventurer
Ultramarine
Gross Tonnage
Ocean Adventurer
4,376 GT
Ultramarine
13,000 GT
Length
Ocean Adventurer
101 m
Ultramarine
128 m
Beam
Ocean Adventurer
16 m
Ultramarine
20 m
Passengers
Ocean Adventurer
128
Ultramarine
199
Crew
Ocean Adventurer
86
Ultramarine
140
Decks
Ocean Adventurer
—
Ultramarine
—
Year Built
Ocean Adventurer
1,975
Ultramarine
2,021
Space Ratio
Ocean Adventurer
34.2 GT/pax
Ultramarine
65.3 GT/pax
Passenger:Crew Ratio
Ocean Adventurer
1.49 :1
Ultramarine
1.42 :1
| Specification | Ocean Adventurer | Ultramarine |
|---|---|---|
| Overview | ||
| Cruise Line | Quark Expeditions | Quark Expeditions |
| Class | Expedition | Expedition |
| Status | active | active |
| Year Built | 1,975 | 2,021Winner |
| Dimensions | ||
| Gross Tonnage | 4,376 GT | 13,000 GTWinner |
| Length | 101 m | 128 mWinner |
| Beam | 16 m | 20 mWinner |
| Capacity | ||
| Passengers | 128 | 199Winner |
| Crew | 86 | 140Winner |
| Key Ratios | ||
| Space Ratio | 34.2 GT/pax | 65.3 GT/paxWinner |
| Passenger:Crew Ratio | 1.49:1 | 1.42:1Winner |
| Build | ||
| Builder | P. Wencke & Sohn | Brodosplit |
| Flag | Bahamas | Bahamas |
| IMO Number | 8010101 | 9898840 |
Ocean Adventurer
Comfortable atmosphere for two
1.5:1 passenger-crew ratio means exceptional service
Good value for money
Well-suited for cruise newcomers
Ultramarine
65 GT/pax means plenty of quiet space
1.4:1 passenger-crew ratio means exceptional service
Built in 2021 with modern facilities — great for a first cruise
Good range of onboard options
Free cancellation on most rooms
Bundle & save on your cruise trip
Medical, trip cancellation & luggage cover
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| Draft | — | — |
| Decks | — | — |
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