Leaves in 15 daysSeven Seas Navigator vs Sirena
Side-by-side cruise ship comparison · Updated April 2026
Sirena is the larger vessel at 30,277 GT — 6% more than Seven Seas Navigator's 28,550 GT. Seven Seas Navigator offers more personal space with a space ratio of 58.3 GT per passenger versus 44.3. Seven Seas Navigator edges ahead in service with a passenger-to-crew ratio of 1.5:1, meaning more crew per guest.
Score: 2 – 4
Quick Compare
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Category
Seven Seas Navigator
Sirena
Size
28,550 GT
30,277 GT
Passengers
490
684
Year Built
1999
1999
Crew Ratio
1:1.5
1:1.7
Space Ratio
58.3
44.3
Decks
—
—
Length
171m
181m
From Price
$8,549/pp
—
Comparison Verdict
Sirena is the larger vessel at 30,277 GT — 6% more than Seven Seas Navigator's 28,550 GT. Seven Seas Navigator offers more personal space with a space ratio of 58.3 GT per passenger versus 44.3. Seven Seas Navigator edges ahead in service with a passenger-to-crew ratio of 1.5:1, meaning more crew per guest.
| Category | Winner |
|---|---|
| Size | Sirena |
| Capacity | Sirena |
| Modernity | Tie |
| Service | Seven Seas Navigator |
| Spaciousness | Seven Seas Navigator |
| Decks | Tie |
| Length | Sirena |
| Fleet Power | Sirena |
Bottom line: Sirena leads 4–2 across our categories — strongest in Size. Choose Sirena for overall superiority; pick Seven Seas Navigator if Service matter more to you.
Which Ship Is Right for You?
Choose Seven Seas Navigator if...
- Better service ratio (1.5:1 crew ratio)
- More space per guest (58.3 GT/pax)
You've compared the ships. Now see what they cost.
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Sailing Prices
| Seven Seas Navigator | Sirena | |
|---|---|---|
| Cheapest | $8,549 pp | — |
| Departing | Aug 24 | — |
| Duration | 9 nights | — |
| View Deal |
Prices from Cruisebound. We may earn a commission at no extra cost to you.
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Frequently Asked Questions
How is the comparison score calculated?
We compute scores across 8 categories using real spec data — gross tonnage, passenger capacity, crew capacity, year built, length, deck count, space ratio, and fleet power. Each category awards one point to the winning ship.
What is the space ratio and why does it matter?
Space ratio is gross tonnage divided by passenger capacity. A higher number means more space per guest. Luxury lines typically score above 40; mass-market ships often fall in the 30-40 range.
What does the passenger-to-crew ratio mean?
Passengers per crew member. Lower is better — more staff per guest means better service. Luxury lines aim below 2:1; large mainstream ships may be 3-4:1.
Are the prices shown accurate?
Prices are sourced from Cruisebound and reflect real-time availability. They may change based on cabin type, date, and demand. Click through to see the latest fares.
Can I compare more than two ships?
Yes — up to four ships. Use the search tool on the compare hub page to add additional ships.
How current is the ship data?
Specifications come from our database of 380+ vessels, revalidated every 5 minutes via ISR. The "Updated" timestamp shows when records were last modified.
