SailChecker · Methodology

How we score charter yachts

9,062 yachts, four signals, peer-normalised against the same hull's market. The formula, a worked example, and what we don't yet know.

v1.0 · 2026-05-21 · 7,394 yachts scored · mean 50 · std 15

The Premise

Charter yacht search is mostly a price-and-photo grid. That's not how anyone actually chooses a £10,000 week. The buyer wants to know: relative to other boats in this country, of this type, of this size — is this a good one?

We rank every yacht in the catalogue against its peers, not against an absolute standard. A 2018 Bavaria 40 is judged against other 36–46ft sail boats in its country, not against a 2025 Lagoon 55. Both can score in the top 10% of their own peer group. That's how the score stays useful across the full price spectrum.

The Formula

# sc_score — every yacht in the catalogue (range 0–100, mean 50, std 15) quality_proxy = 0.50 × age_score # exponential decay, tier-modulated + 0.30 × equipment_score # top-decile in peer group on the 18 discriminating items + 0.20 × tier_bonus # builder tier (premium / mid / budget / specialty) value_norm = clip(peer_median_price / yacht_price, 0.4, 2.0) # mapped to [0, 1] raw_score = 0.60 × quality_proxy + 0.40 × value_norm sc_score = 50 + 15 × z(raw_score) # z-score across the fleet, scaled to mean 50 / std 15

What each signal captures

Peer Groups

A peer group is a slice of the catalogue narrow enough that an apples-to-apples comparison makes sense: country × kind × length-bucket.

Example: Croatia · Catamaran · 46–52ft contains 158 yachts. Within that slice, every yacht is z-scored against its peers. Top of that group means "best 46–52ft Croatian catamaran" — not "best catamaran globally". A 39ft monohull in Greece never competes with it, because no buyer is choosing between them.

The same boat — say a 2024 Dufour 40 — would be ranked once against its Croatian peers, and a separate Dufour 40 in Greece would be ranked against its Greek peers. The same hull can score differently in different markets, which is correct.

Live worked example — Croatia · Catamaran · 46–52ft

Pulled fresh from the index when this page loaded.

# Yacht Builder Year Length Score
Loading peer group…

The Current #1, Walked Through

Top of the leaderboard right now is Sonea — a 2025 Leopard 50 catamaran in Croatia, scored 91. Here's why.

Age
1-year-old hull · premium-volume tier · slow decay
Equipment
31 items listed · top decile in peer group
Tier
Leopard · premium-volume builder
Value
No peer median price yet (see caveats)

The story behind the number

Sonea is a 2025 hull — practically new — by Leopard, which sits in our top builder tier. Equipment-wise it's one of the most thoroughly-fitted boats in its peer group: 31 listed items including Ice maker, Watermaker, Inverter, Solar, Hydraulic gangway, Dishwasher, Washer/Dryer, Wi-Fi, BBQ, Teak cockpit, Underwater lights, Stand-up paddle.

It's also a single-yacht owner-operator. Of the 854 operators we index, 283 (33%) run a single yacht. That cohort holds only 3.8% of inventory — but it punches above its weight at the top of the leaderboard, because owner-operators tend to fit boats meticulously and care like an owner.

Where the Score is Honest About Itself

Caveat 1 · Value axis is warming up

~85% of yachts don't yet have a confirmed peer-median price because of an upstream collector bug (date-range error — fixed 2026-05-21, backfill pending). Until the backfill completes, the score is driven by age × equipment × tier with value at neutral 0.5. Once the backfill lands, rankings will sharpen — expect boats that win on quality but lose on price-vs-peer to drop, and good-value peer-matchers to rise.

Caveat 2 · MMK-only catalogue

The 9,062 yachts indexed all come from Booking Manager (MMK). Operators on other platforms — Dream Yacht Charter, Navigare Yachting, Catamaran Charter — aren't here yet. A Nausys integration is on the roadmap; until then, leaderboards read as "best in the MMK catalogue", not "best in the world".

Caveat 3 · Listing thoroughness is not yacht quality

Equipment_score is based on what the operator chose to list in MMK. We exclude universally-fitted items so the score can't be gamed by listing every commonplace fitting, but we can't fully control for operator data hygiene. A genuinely well-equipped boat with a lazy listing will score lower than it should. Cross-checking with rating data is unreliable because only 48% of yachts have any reviews and 62% of those have ≤4. We're thinking about an operator-quality overlay; not built yet.

Caveat 4 · Summer charter assumption

The current formula optimises for summer charter — heating drops out, A/C and shade matter. Shoulder-season buyers (Turkey October, Caribbean January) get a different equipment trade-off; a seasonal toggle is in the design but not yet shipped.

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