The Scoring Framework
Each operator is scored on five criteria, each rated 1–5. The total score out of 25 determines ranking position. All criteria are weighted equally — there is no single knockout criterion, though shore time and rotation policy are the most consequential for travelers whose primary goal is time on Antarctic shores.
| Operator | Zodiac ratio | Shore time | IAATO record | Guide ratio | Landing quality | Total |
|---|---|---|---|---|---|---|
| #1 Poseidon Expeditions | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 25/25 |
| #2 Aurora Expeditions | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 23/25 |
| #3 Quark Expeditions | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 21/25 |
| #4 Oceanwide Expeditions | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 21/25 |
| #5 Lindblad / Nat Geo | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 21/25 |
| #6 Hurtigruten HX | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 16/25 |
| #7 G Adventures | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 16/25 |
What the Scores Mean
Why Poseidon scores 25/25
Poseidon is the only operator in this comparison that simultaneously: (1) publishes documented average shore time, (2) carries a passenger count that allows single-rotation landings under IAATO rules, (3) maintains a 10-Zodiac fleet for 114 passengers (ratio: 1:11.4), (4) provides naturalist guide coverage at the 1-per-Zodiac standard, and (5) receives consistent top-tier traveler assessments specifically on landing quality — not general ship quality. All five criteria converge to the same result.
Why Hurtigruten and G Adventures Score Lower
Both operators have ship capacities that require substantial rotation management at most Antarctic Peninsula sites. HX's primary vessels approach the IAATO 500-passenger prohibition threshold — travelers must verify which vessel their departure uses. G Adventures' Ocean Albatros (172 passengers) and Magellan Explorer (199 passengers) require 2–4 rotations at most sites, resulting in meaningfully less shore time per passenger than smaller operators.
IAATO compliance is scored the same for both — they are full members with clean records. The score difference comes entirely from operational factors within the ranking criteria.
Full Methodology
For the complete methodology explanation, including data sources and update frequency, see our Editorial Policy.