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 |
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Boats For Sale in Washington, United States Similar to the 2019 Armstrong Marine 38 Monohull Aluminum
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 2019 Armstrong Marine 38 Monohull Aluminum | ||||||
|---|---|---|---|---|---|---|
| Price | $495,000 | $499,000 | $423,812 | $399,900 | $385,000 | $380,000 |
| Location | Seattle | Gig Harbor | Seattle | Olympia | Freeland | Freeland |
| Nominal Length | 38' | 35' | 26' | 38' | 35' | 35' |
| Engine Make | Cummins | Yamaha | Mercury | Cummins | Cummins | Cummins |
| Total Engine Power | 419 hp | 300 hp | 200 hp | 419 hp | 380 hp | 380 hp |
| Days on Market | 1 | 234 | 350 | 26 | 1 | 1 |
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909 N Tomahawk Island Dr #104, Portland, OR, 97217
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