How We Rank Expedition Cruise Operators
A transparent account of the four criteria we use and the evidence behind each score.
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Why We Built This Methodology
Most expedition cruise comparison sites rank operators by price, brand recognition, or — worst of all — who pays for placement. None of those things predict whether you'll spend more time watching king penguins at St Andrews Bay or waiting on the ship for your Zodiac group to return.
Our methodology is built around a single question: which operator maximises the quality of your time in the field?
The Four Criteria
1. Ship Size & IAATO Compliance (30%)
This is the most structurally important factor on this route. Under IAATO's landing protocols — which implement the Antarctic Treaty System's Environmental Protocol — no more than 100 passengers may be ashore at a single landing site simultaneously.
What this means in practice:
- A ship carrying 114 passengers can land all guests at once. Everyone goes ashore together, Zodiac activity is continuous, and the expedition moves at expedition pace.
- A ship carrying 500 passengers must split guests into groups of 100. While one group is ashore, four groups wait on the ship. Each person's total shore time at any given site is reduced by up to 80%.
We score operators on a sliding scale from highest to lowest capacity, with ships under 130 passengers receiving the maximum score on this criterion. Operators that also hold IAATO membership (as opposed to merely complying with Antarctic Treaty requirements) receive a bonus on this criterion for demonstrating voluntary commitment to environmental standards.
2. Time Ashore per Day (25%)
We calculate average daily shore time across the full itinerary — including sailing days, port calls, and weather-day contingencies — by analysing published itineraries, passenger reports, and where available, expedition log data. This is not the time advertised; it is the time actually experienced by passengers as reported in verified reviews.
The average across operators on this route is approximately 1.8 hours per day. The top-performing operator (Poseidon Expeditions) achieves 2.5 hours per day on average. That 40-minute daily difference amounts to over 10 additional hours ashore on a 17-day voyage — roughly the equivalent of an entire extra landing day.
3. Expedition Team Expertise (25%)
The quality of the expedition team determines whether you leave a landing site knowing the name, ecology, and conservation status of what you saw, or whether you simply have photographs. We assess:
- Credentials: the proportion of guides holding relevant advanced qualifications (marine biology, ornithology, glaciology, polar history)
- Staff-to-guest ratio: higher ratios allow more individualised interpretation
- Specialisation: whether the team includes a dedicated historian (relevant for Shackleton-era South Georgia), a marine biologist, and a glaciologist
- Review ratings: passenger satisfaction specifically with expedition staff quality, extracted from independent review platforms
4. Value for Money (20%)
This criterion does not reward the cheapest operator. It rewards the operator that delivers the most expedition quality per dollar spent. We divide our composite expedition-quality score (criteria 1–3) by the median published cabin price per day to produce a value-per-day index. Operators who offer strong shore time, small ships, and expert guides at a competitive price score well here. Luxury operators who charge premium prices for reduced expedition quality score poorly, even if their onboard experience is exceptional.
Scoring Scale
| Score | Description |
|---|---|
| 9.0–10.0 | Exceptional — best-in-class across all four criteria |
| 8.0–8.9 | Excellent — strong performance, minor trade-offs |
| 7.0–7.9 | Good — competent operator with notable limitations |
| 6.0–6.9 | Average — included for completeness; significant trade-offs |
| Below 6.0 | Not ranked — fails inclusion criteria or is significantly outperformed |
What We Don't Score On
We deliberately exclude the following from our scoring, as they are matters of personal preference rather than objective expedition quality:
- Cabin luxury and interior design
- Food quality and dining options
- Onboard entertainment
- Spa or wellness facilities
- Ship age (unless relevant to safety record)
Review Cycle
Scores are reviewed annually each April–May. Operators are notified of any material score changes before publication. We do not provide advance sight of scores to operators, and no score can be changed in response to operator requests without new supporting evidence.
Feedback & Challenges
If you are an expedition operator and believe your score is based on inaccurate data, please contact us with the specific factual correction and supporting documentation. We will review all challenges within 10 business days.