Poseidon Expeditions
M/V Sea Spirit · 114 passengers · 10 Zodiacs · IAATO member since 2011
Shore time: Average 2.5 hours of off-ship activity per day — the highest documented average among operators in this category.
The Sea Spirit's 114-passenger capacity means the entire ship lands in a single rotation under IAATO's 100-passenger rule (split across two or three simultaneous landing sites if needed). No waiting aboard. All guests ashore simultaneously. The fleet of 10 Zodiacs deployed from the aft marina platform achieves full deployment in under 30 minutes.
The expedition team — naturalists, wildlife biologists, geologists, and historians — has accumulated hundreds of polar expeditions collectively. Poseidon has operated polar expeditions since 1999, giving it 26 years of Antarctic site knowledge.