Side-by-side cruise ship comparison · Updated February 2026
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 Explorer
Ultramarine
Gross Tonnage
Ocean Explorer
8,000 GT
Ultramarine
13,000 GT
Length
Ocean Explorer
104.4 m
Ultramarine
128 m
Beam
Ocean Explorer
18.4 m
Ultramarine
20 m
Passengers
Ocean Explorer
138
Ultramarine
199
Crew
Ocean Explorer
92
Ultramarine
140
Decks
Ocean Explorer
6
Ultramarine
—
Year Built
Ocean Explorer
2,021
Ultramarine
2,021
Space Ratio
Ocean Explorer
58.0 GT/pax
Ultramarine
65.3 GT/pax
Passenger:Crew Ratio
Ocean Explorer
1.50 :1
Ultramarine
1.42 :1
| Specification | Ocean Explorer | Ultramarine |
|---|---|---|
| Overview | ||
| Cruise Line | Quark Expeditions | Quark Expeditions |
| Class | Expedition | Expedition |
| Status | active | active |
| Year Built | 2,021 | 2,021 |
| Dimensions | ||
| Gross Tonnage | 8,000 GT | 13,000 GTWinner |
| Length | 104.4 m | 128 mWinner |
| Beam | 18.4 m | 20 mWinner |
| Capacity | ||
| Passengers | 138 | 199Winner |
| Crew | 92 | 140Winner |
| Key Ratios | ||
| Space Ratio | 58.0 GT/pax | 65.3 GT/paxWinner |
| Passenger:Crew Ratio | 1.50:1 | 1.42:1Winner |
| Build | ||
| Builder | Brodogradiliste Uljanik | Brodosplit |
| Flag | Bahamas | Bahamas |
| IMO Number | 9887066 | 9898840 |
Ocean Explorer
58 GT/pax means plenty of quiet space
1.5:1 passenger-crew ratio means exceptional service
Built in 2021 with modern facilities — great for a first cruise
Good range of onboard options
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
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Medical, trip cancellation & luggage cover
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| Draft | 6.7 m | — |
| Decks | 6 | — |
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