This 2006 Shamrock 270 Mackinaw is a 31-foot (LOA) inboard-powered pilothouse cruiser designed for rugged, all-weather fishing and light cruising. Known for its stable, fuel-efficient modified-V hull designed with a prop pocket (or tunnel) to minimize draft and shaft angle, it features a large, open cockpit and an enclosed pilot cabin. It is a durable choice for anglers seeking protection from the changeable elements of the Monterey and San Francisco Bays, as well as colder, more northern climates. 

As Shamrock Marine is no longer in production, these vessels are considered a highly sought-after, niche vessel, often described as being in a class of its own for its size range.

This 2006 Shamrock 270 Mackinaw is a 31-foot (LOA) inboard-powered pilothouse cruiser designed for rugged, all-weather fishing and light cruising. Featuring a modified-V hull designed with a prop pocket (or tunnel) to minimize draft and shaft angle, this design offers a stable, efficient, and rugged inboard ride with a shallower draft and features a large, open cockpit and an enclosed pilot cabin. It is a durable choice for anglers seeking protection from the changeable elements of the Monterey and San Francisco Bays, as well as colder, more northern climates. 

Key Features and Design:

• Length: 31' (LOA); actual hull length is ~ 28' 10", but overall length is 31', including the bow pulpit.
• Engine: Inboard (single) Yanmar 24-valve, 315HP Diesel, 50 hours (new in 2023); Bennett recessed hydraulic trim tabs; Racor fuel/water separator; fresh water cooling; Seastar hydraulic steering.
• Keel: Features a modified-V hull designed with a prop pocket (or tunnel) to minimize draft and shaft angle, rather than the "Keel Drive" signature keel found on smaller Shamrock models. This design offers a stable, efficient, and rugged inboard ride with a shallower draft, featuring a manganese bronze keel shoe for structural integrity. 
• Hull Construction: Solid fiberglass.
• Tanks: Fuel 150 gal (new in 2024); water 25 gal; holding 15 gal, hot water 6 gal.
• Performance: Typically cruises at 18 knots, but can reach top speeds in the high 20s.
• Fully Enclosed Cabin: Features a starboard helm and solid, lockable pilothouse and windows, providing protection from weather.
• Galley: A small galley area with stove, microwave, refrigerator (new in 2023), fresh water sink; dinette with removable table.
• Berth: Forward V-berth (sleeps 2 adults).
• Head: Enclosed, compact head (limited sitting headroom).
• Fishing Cockpit: Includes a transom door, trolling valve, Canon downrigger mounts (2); rod holders and livewell; in-deck storage/fish boxes, bait tank, fish hold. Aft-facing bench seating lends ample room for fishing.
• Electronics: Raymarine SmartPilot autopilot; West Marine radio VHF 585; Radar/GPS Garmin GPS Map 7612 XSV.
• Electrical: Main battery and house battery; 110V shore power.
• Versatility: Suitable for fishing and overnight trips. 

Current Market: As Shamrock Marine is no longer in production, these sought-after vessels are primarily found on the used market.