• Slide: The Image of 1987 Shamrock 31 GS boat docked, featuring a tall tower and spacious deck. - 1The Image of 1987 Shamrock 31 GS boat docked, featuring a tall tower and spacious deck. - 1
  • Slide: The Image of Engine compartment of a 1987 Shamrock 31 GS with dual Yanmar diesel engines. - 2The Image of Engine compartment of a 1987 Shamrock 31 GS with dual Yanmar diesel engines. - 2
  • Slide: The Image of 1987 Shamrock 31 GS cabin interior with white seating and wooden flooring. - 3The Image of 1987 Shamrock 31 GS cabin interior with white seating and wooden flooring. - 3
  • Slide: The Image of 1987 Shamrock 31 GS boat docked by the water on a clear day. - 4The Image of 1987 Shamrock 31 GS boat docked by the water on a clear day. - 4
  • Slide: The Image of 1987 Shamrock 31 GS boat docked, featuring a tall tower and "Lady Marie" name on the stern. - 5The Image of 1987 Shamrock 31 GS boat docked, featuring a tall tower and "Lady Marie" name on the stern. - 5
  • Slide: The Image of 1987 Shamrock 31 GS boat interior with steering wheel and storage cabinet. - 6The Image of 1987 Shamrock 31 GS boat interior with steering wheel and storage cabinet. - 6
  • Slide: The Image of Fishing tackle storage on a 1987 Shamrock 31 GS boat, featuring organized lures and drawers. - 7The Image of Fishing tackle storage on a 1987 Shamrock 31 GS boat, featuring organized lures and drawers. - 7
  • Slide: The Image of Control panel of a 1987 Shamrock 31 GS boat with steering wheel and gauges. - 8The Image of Control panel of a 1987 Shamrock 31 GS boat with steering wheel and gauges. - 8
  • Slide: The Image of 1987 Shamrock 31 GS engine hour meters showing 1039 and 1028 hours. - 9The Image of 1987 Shamrock 31 GS engine hour meters showing 1039 and 1028 hours. - 9
  • Slide: The Image of Dual throttle controls on a 1987 Shamrock 31 GS boat. - 10The Image of Dual throttle controls on a 1987 Shamrock 31 GS boat. - 10
  • Slide: The Image of 1987 Shamrock 31 GS boat dashboard with radio and Northstar navigation system. - 11The Image of 1987 Shamrock 31 GS boat dashboard with radio and Northstar navigation system. - 11
  • Slide: The Image of 1987 Shamrock 31 GS boat control panel with navigation buttons and display. - 12The Image of 1987 Shamrock 31 GS boat control panel with navigation buttons and display. - 12
  • Slide: The Image of 1987 Shamrock 31 GS boat interior with foldable seat and metal support. - 13The Image of 1987 Shamrock 31 GS boat interior with foldable seat and metal support. - 13
  • Slide: The Image of 1987 Shamrock 31 GS boat interior with white captain's chair and steering wheel. - 14The Image of 1987 Shamrock 31 GS boat interior with white captain's chair and steering wheel. - 14
  • Slide: The Image of Engine compartment of a 1987 Shamrock 31 GS boat, showcasing dual engines and mechanical components. - 15The Image of Engine compartment of a 1987 Shamrock 31 GS boat, showcasing dual engines and mechanical components. - 15
  • Slide: The Image of Engine compartment of a 1987 Shamrock 31 GS with Yanmar diesel engine. - 16The Image of Engine compartment of a 1987 Shamrock 31 GS with Yanmar diesel engine. - 16
  • Slide: The Image of Engine compartment of a 1987 Shamrock 31 GS boat, showing detailed wiring and components. - 17The Image of Engine compartment of a 1987 Shamrock 31 GS boat, showing detailed wiring and components. - 17
  • Slide: The Image of Engine room of a 1987 Shamrock 31 GS boat, featuring various mechanical components and wiring. - 18The Image of Engine room of a 1987 Shamrock 31 GS boat, featuring various mechanical components and wiring. - 18
  • Slide: The Image of Engine compartment of a 1987 Shamrock 31 GS boat, showing various mechanical components. - 19The Image of Engine compartment of a 1987 Shamrock 31 GS boat, showing various mechanical components. - 19
  • Slide: The Image of 1987 Shamrock 31 GS cabin interior with seating, cushions, and storage boxes. - 20The Image of 1987 Shamrock 31 GS cabin interior with seating, cushions, and storage boxes. - 20
  • Slide: The Image of Interior of 1987 Shamrock 31 GS boat with compact fridge and control panel. - 21The Image of Interior of 1987 Shamrock 31 GS boat with compact fridge and control panel. - 21
  • Slide: The Image of 1987 Shamrock 31 GS boat interior with white seating and teal cushions. - 22The Image of 1987 Shamrock 31 GS boat interior with white seating and teal cushions. - 22
  • Slide: The Image of 1987 Shamrock 31 GS boat bathroom with toilet, sink, and wooden cabinet. - 23The Image of 1987 Shamrock 31 GS boat bathroom with toilet, sink, and wooden cabinet. - 23
  • Slide: The Image of 1987 Shamrock 31 GS boat tower with blue sky background. - 24The Image of 1987 Shamrock 31 GS boat tower with blue sky background. - 24
  • Slide: The Image of 1987 Shamrock 31 GS boat helm with steering wheel and controls, docked by wooden pier. - 25The Image of 1987 Shamrock 31 GS boat helm with steering wheel and controls, docked by wooden pier. - 25
  • Slide: The Image of 1987 Shamrock 31 GS boat docked at marina, view from bow. - 26The Image of 1987 Shamrock 31 GS boat docked at marina, view from bow. - 26
  • Slide: The Image of 1987 Shamrock 31 GS boat docked, aerial view of spacious deck and fishing rod holders. - 27The Image of 1987 Shamrock 31 GS boat docked, aerial view of spacious deck and fishing rod holders. - 27
  • Slide: The Image of 1987 Shamrock 31 GS boat with tower, docked under clear blue sky. - 28The Image of 1987 Shamrock 31 GS boat with tower, docked under clear blue sky. - 28
  • Slide: The Image of 1987 Shamrock 31 GS boat with tower, docked under clear blue sky. - 29The Image of 1987 Shamrock 31 GS boat with tower, docked under clear blue sky. - 29
  • Slide: The Image of 1987 Shamrock 31 GS boat docked by the water, showcasing spacious deck area. - 30The Image of 1987 Shamrock 31 GS boat docked by the water, showcasing spacious deck area. - 30
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1987 Shamrock 31 GS

$67,500

Used

Boat in Grasonville, MD 21638 US

builtBuilt in 1987
Year the boat was built
model

31 GS

Boat model
engine

1 Engine (Yanmar)

Engine type and count
length

31 feet

Overall boat length
fuel

Diesel

Fuel type
material

Fiberglass/Reinforced

Hull material
The 31 Grand Slam, however, was built on a conventional deep-V hull and she was powered by twin inboard engines. At first glance she appears to be a fairly standard open sport fisherman with a large fishing cockpit. A closer look reveals several interesting features. The helm seat, for example, can be converted into a leaning post. Engine access is good-a unique central service bay houses all the mechanical and electrical systems. The cockpit features modular tackle centers, rod holders and storage bins. For accommodations, there are four single berths below (the dinette seatbacks convert to single bunks) and a standup head with shower. Standard gas engines did not prove particularly popular with buyers. Early models with optional 250hp Cummins diesels cruise at 28 knots and reach 33 knots wide open. Cummins 300hp diesels (available after 1990) cruise at 30 knots and deliver 34-35 knots top. About 160 were built during her production run.
Nominal Length
31ft
Length Overall
31ft
Length at Waterline
30ft
Beam
11.33ft
Max Bridge Clearance
18ft
Drive Up Draft
3.33ft
Deadrise At Transom
19deg
Dry Weight
10800lb
Cabins
1
Heads
1
Seating Capacity
8
Fresh Water Tanks
40gal
Fuel Tanks
290gal
Hull Material
fiberglass
Hull Shape
deep-vee
Engine 1
Engine Make
Yanmar
Engine Type
inboard
Fuel Type
diesel
Drive Type
stern

Price History

DateEventPrice
10/15/25Initial price$67,500

Overview from around the web 1987 Shamrock 31 GS

Customers appreciate the 1987 Shamrock 31 GS for its classic design and solid craftsmanship

Many highlight its sturdy build and comfortable layout, making it a reliable choice for both cruising and day sailing. Owners often mention the spacious cockpit and well-thought-out interior, which provide ample room for relaxing and entertaining. Additionally, the boat's handling is praised for being responsive and manageable, especially in varied wind conditions. Overall, feedback reflects satisfaction with the Shamrock 31 GS as a timeless sailboat that combines performance with classic style.

The Biggest Pros and Cons

The 1987 Shamrock 31 GS offers a blend of classic design and solid performance, making it a popular choice among sailing enthusiasts. Here are some pros and cons to consider:

Pros

Sturdy Construction: Built with quality fiberglass, the Shamrock 31 GS is known for its durability and long-lasting build.

Classic Styling: The boat features timeless lines and a traditional aesthetic that appeals to sailors who appreciate classic yacht design.

Spacious Interior: For a 31-foot vessel, it offers a comfortable and well-laid-out cabin space, suitable for weekend cruising.

Good Sailing Performance: The boat handles well under sail, providing a stable and responsive sailing experience in a variety of conditions.

Manageable Size: Its size makes it easier to handle for small crews or even single-handed sailing, while still offering enough space for comfort.

Cons

Older Design Features: Being a model from 1987, some aspects of the design and equipment may feel dated compared to modern sailboats.

Maintenance Needs: As with any older boat, ongoing maintenance and potential upgrades to systems or rigging may be necessary to keep it in optimal condition.

Limited Modern Amenities: The boat may lack some of the conveniences and technology found in newer models, such as advanced navigation systems or modern interior fittings.

Weight and Speed: It may be heavier and slightly slower compared to newer, lighter designs intended for performance cruising.

Made For

The 1987 Shamrock 31 GS is ideal for sailing enthusiasts who appreciate a classic, well-crafted cruiser with a blend of performance and comfort. It’s perfect for those seeking a reliable and stylish boat for coastal cruising, weekend getaways, or extended voyages, offering spacious accommodations and solid handling for both novice and experienced sailors.

Finance your dream boat!

Use our boat payment calculator to estimate monthly payments for 1987 Shamrock 31 GS. Enter your down payment, choose a loan term, and adjust the interest rate to see an instant payment estimate — ideal if you're calculating boat payments before you enquire. Wondering how much does a Commercial cost in today's market, or how much does a Shamrock cost for similar models? This boat financing calculator helps you compare scenarios in seconds, whether you're considering used boat financing or a new purchase.
Monthly payment
$766.11/mo
$
$
Loan amount$ 67,500
OR
%

Finance your dream boat!

Use our boat payment calculator to estimate monthly payments for 1987 Shamrock 31 GS. Enter your down payment, choose a loan term, and adjust the interest rate to see an instant payment estimate — ideal if you're calculating boat payments before you enquire. Wondering how much does a Commercial cost in today's market, or how much does a Shamrock cost for similar models? This boat financing calculator helps you compare scenarios in seconds, whether you're considering used boat financing or a new purchase.
Monthly payment
$766.11/mo
$
$
Loan amount$ 67,500
OR
%

Contact Galahad Marine Sales

400 Drummer Drive, Grasonville, MD, 21638

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Address

400 Drummer Drive
Grasonville, MD 21638

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Contact Galahad Marine Sales about 1987 Shamrock 31 GS

400 Drummer Drive, Grasonville, MD, 21638

By checking this box, I consent to receive recurring marketing text messages, phone calls, and emails from Galahad Marine Sales at the number and email provided, including messages sent using an autodialer or prerecorded voice. Message frequency varies. Message and data rates may apply. Reply STOP to opt out or HELP for assistance. Consent is not a condition of purchase. We'll also send helpful email updates about your boat search. You can unsubscribe whenever you like. See Terms of Use and Privacy Policy.

Contact Galahad Marine Sales

400 Drummer Drive, Grasonville, MD, 21638

By checking this box, I consent to receive recurring marketing text messages, phone calls, and emails from Galahad Marine Sales at the number and email provided, including messages sent using an autodialer or prerecorded voice. Message frequency varies. Message and data rates may apply. Reply STOP to opt out or HELP for assistance. Consent is not a condition of purchase. We'll also send helpful email updates about your boat search. You can unsubscribe whenever you like. See Terms of Use and Privacy Policy.

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