2019 Armstrong Marine 38 Monohull Aluminum Boat in Seattle, WA 98101 US
Built in 2019
38 Monohull Aluminum
2 Engines (2x Cummins)
38 feet
Diesel
Aluminum
Sentry is a purpose-built 2019 Armstrong Marine 38 Monohull combining welded-aluminum commercial construction, a large working deck and an enclosed all-weather pilothouse. Although designated as a 38-foot model, her transom working-platform configuration brings overall length to approximately 43 feet, with a substantial 13-foot beam.
Twin Cummins QSB6.7 diesels rated at 419 hp each are coupled to ZF 286A straight-drive transmissions. During the May 2025 survey sea trial, Sentry recorded approximately 21.5 knots at 2,400 rpm and 28 knots at 3,000 rpm in calm conditions.
Originally owned and operated by the Washington State Department of Natural Resources, Sentry was acquired by her present owner for overseas commercial projects.
Sentry offers a practical platform for commercial utility work, environmental or hydrographic survey, dive support, patrol, crew transport, research operations or conversion into a distinctive private expedition boat.
Price History
| Date | Event | Price |
|---|---|---|
| 8/13/26 | Initial price | $495,000 |
2019 Armstrong Marine 38 Monohull Aluminum Video Tours
Overview from around the web 2019 Armstrong Marine 38 Monohull Aluminum
The 2019 Armstrong Marine 38 Monohull Aluminum has received positive feedback from customers, highlighting its exceptional craftsmanship and performance on the water
Many users appreciate the sturdy, lightweight aluminum construction, which provides both durability and agility. The design is commended for its spacious and functional layout, making it ideal for both recreational use and serious fishing trips. Customers frequently mention the boat’s impressive stability and seaworthiness, allowing for smooth navigation in a variety of conditions. The engine performance is also praised, with many noting quick acceleration and efficient fuel consumption. Additionally, the customizable features and thoughtful storage solutions have garnered attention, making it a great choice for those who value practicality and comfort. Overall, the 2019 Armstrong Marine 38 Monohull Aluminum is lauded as a reliable vessel that combines innovation with tradition, meeting the needs of boating enthusiasts and adventurers alike.
Made For
The 2019 Armstrong Marine 38 Monohull Aluminum is designed for both seasoned mariners and those new to the boating world, catering to a diverse range of users. Ideal for adventurous families, fishing enthusiasts, and weekend cruisers alike, this vessel offers a perfect blend of performance, durability, and comfort. With its robust aluminum construction, the 38 Monohull is perfect for navigating a variety of waters, from serene lakes to challenging coastal conditions. It is well-suited for recreational boaters seeking a reliable and sturdy companion for exploration or leisure, as well as professional users needing a dependable platform for work or rescue operations. For those who appreciate customizability, the Armstrong Marine 38 allows for tailored features to enhance the experience on the water, making it an appealing choice for individuals wanting to create a vessel that meets their specific needs. Overall, this boat is an exceptional choice for anyone looking to combine functionality with style, ensuring unforgettable adventures on the horizon.
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 2019 Armstrong Marine 38 Monohull Aluminum | ||||||
|---|---|---|---|---|---|---|
| Price | $495,000 | $499,000 | $423,812 | $399,900 | $385,000 | $109,999 |
| Location | Seattle | Gig Harbor | Seattle | Olympia | Freeland | Stanwood |
| Nominal Length | 38' | 35' | 26' | 38' | 35' | 26' |
| Engine Make | Cummins | Yamaha | Mercury | Cummins | Cummins | Honda |
| Total Engine Power | 419 hp | 300 hp | 200 hp | 419 hp | 380 hp | 250 hp |
| Days on Market | 1 | 247 | 363 | 39 | 1 | 77 |
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909 N Tomahawk Island Dr #104, Portland, OR, 97217
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