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Seeker 31
Designer: Angus Primrose  ·  Builder: Gardas Marine  ·  First built: 1970
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About the Seeker 31

Designed as a capable and versatile cruising sailboat, the Seeker 31 offers sailors a solid platform for coastal adventures and extended passages alike. With a hull length that places it comfortably in the mid-size cruiser category, this boat appeals to those seeking a manageable yet capable vessel that doesn't sacrifice seakeeping ability for convenience. While detailed specifications on the Seeker 31 are relatively limited in the public domain, the boat has earned a modest following among cruising sailors who value its practical layout and dependable sailing characteristics. Boats in this class typically prioritize comfortable accommodation for short-handed sailing, making the Seeker 31 a reasonable choice for couples or small crews looking to explore coastal waterways or tackle overnight passages with confidence. For prospective buyers, the Seeker 31 represents an entry point into serious cruising without the complexity and cost of larger offshore vessels. As with any boat in this segment, condition and fit-out will vary significantly between examples, so a thorough survey is strongly recommended. Sailors drawn to straightforward, purposeful cruisers will find the Seeker 31 worth a closer look.

Core Dimensions
LOA (Length Overall) 30.51 ft / 9.30 m
LWL (Waterline Length) 22.47 ft / 6.85 m
Beam 9.51 ft / 2.90 m
Max Draft 5.58 ft / 1.70 m
Displacement 6,944.00 lb / 3,150 kg
Ballast 3,351.00 lb / 1,520 kg
Sail Area (Reported) 326.00 ft² / 30.29 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Masthead Sloop
Construction FG
Designer Angus Primrose
Builder Gardas Marine
First Built 1970
Owner Reviews

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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
14.38
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
21.47
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
2
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.35
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 763.54
How It Compares

vs. Chance 30 30 Allied, Nicholson 31, Windward 30

This boat Similar boats
Dimensions
LOA
Seeker 31 ★
30.5 ft
Chance 30 30 Allied
30.6 ft
Nicholson 31
30.5 ft
Windward 30
30.5 ft
LWL
Seeker 31 ★
22.5 ft
Chance 30 30 Allied
25.0 ft
Nicholson 31
24.2 ft
Windward 30
22.8 ft
Beam
Seeker 31 ★
9.5 ft
Chance 30 30 Allied
10.0 ft
Nicholson 31
10.2 ft
Windward 30
9.2 ft
Displacement
Seeker 31 ★
6 lbs
Chance 30 30 Allied
11 lbs
Nicholson 31
13 lbs
Windward 30
8 lbs
Ballast
Seeker 31 ★
3 lbs
Chance 30 30 Allied
6 lbs
Nicholson 31
4 lbs
Windward 30
3 lbs
Sail Area
Seeker 31 ★
326 sq ft
Chance 30 30 Allied
483 sq ft
Nicholson 31
484 sq ft
Windward 30
Performance
PHRF Rating (lower = faster)
Seeker 31 ★
Chance 30 30 Allied
Nicholson 31
194 s/nm
Windward 30
192 s/nm
SA / Displacement (higher = more powerful)
Seeker 31 ★
14.4
Chance 30 30 Allied
15.5
Nicholson 31
14.1
Windward 30
Comfort Ratio (higher = more comfortable offshore)
Seeker 31 ★
21.5
Chance 30 30 Allied
30.2
Nicholson 31
35.0
Windward 30
Capsize Screening (lower = safer)
Seeker 31 ★
2.00
Chance 30 30 Allied
1.79
Nicholson 31
1.74
Windward 30
Hull Speed
Seeker 31 ★
6.4 kts
Chance 30 30 Allied
6.7 kts
Nicholson 31
6.6 kts
Windward 30
Speed Number (higher = faster)
Seeker 31 ★
Chance 30 30 Allied
1.5
Nicholson 31
0.9
Windward 30
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