2006 Navigator 34 Californian Boat in San Francisco, CA 94107 US

• Espar D5 Diesel Heat
• stereo system w/ Bluetooth
• 2000w inverter/charger
• Bow thruster
• Stern thruster
• Lewmar 700 Windlass
• Simrad GPS Chartplotter / Fish Finder / Sonar
• Raymarine AUTO Pilot
• GPS
• Digital depth sounder
• VHF radio
• Second helm seat (installs in place of dining table)
• Cockpit seat
• Dry head (separate shower stall)
• Barbecue
• Dinghy Davits
• Microwave
• 2 burner stove
• Refrigerator

The single Volvo Penta D6-310 inboard engine transformed the modern,  Navigator Californian 34 (Express/Cruiser) into a highly optimized, dual-character vessel. By pairing a relatively lightweight fiberglass hull (roughly 13,500 lbs displacement) with an electronic, common-rail 5.5-liter inline-6 diesel, this package bridges the gap between a slow-moving, traditional trawler and a modern high-speed cruiser.

Its performance efficiency splits neatly into two operating profiles:

1. Displacement Speed (Maximum Fuel Economy)

At hull speed, the single D6-310 operates with remarkable efficiency, largely due to its high low-end torque and electronic fuel mapping. 

• Cruising Speed: 7.5 to 8.0 knots.
• Engine RPM: ~1,500 – 1,800 RPM.
• Estimated Fuel Burn: 2.0 to 3.0 gallons per hour (GPH) total.
• Efficiency: Approaching 2.5 to 3.0 nautical miles per gallon (NMPG). At this pace, the vessel operates as a hyper-economical coastal pocket trawler, sipping fuel and maximizing cruising range.

2. Semi-displacement (Fast Cruise)

When the throttle is pushed down, the D6-310 utilizes a scroll-type turbocharger and double overhead camshafts to quickly lift the modified-V hull out of the water.

• Cruising Speed: 10 to 12 knots (with a top speed around 17 knots).
• Engine RPM: ~3,000 – 3,250 RPM.
• Estimated Fuel Burn: 11 to 14 gallons per hour (GPH).
• Efficiency: Dropping to roughly 1.2 to 1.4 nautical miles per gallon (NMPG). While the fuel burn numbers jump dramatically compared to hull speed, this remains incredibly efficient for a 34-to-36-foot cruising yacht moving at planing speeds.

Key Technical Factors Driving This Efficiency

• Massive Low-End Torque: The D6 architecture is explicitly designed for a "marine torque" profile. It generates maximum torque at low-to-mid RPMs, meaning the single engine doesn't have to strain or over-rev to push the boat over its bow wave and onto a flat plane.
• Common-Rail Fuel Injection: Managed by Volvo's Electronic Vessel Control (EVC), the common-rail system injects fuel at extreme pressures with microscopic precision. This translates to complete fuel combustion, no traditional diesel smoke, and optimized burn rates across varying water temperatures and loads. 
• The Single-Engine Advantage: Compared to twin-engine configurations found on older 34-foot Californians, a single-engine layout eliminates the mechanical drag, weight, and friction of a second drivetrain. This allows a greater percentage of the 310 horsepower to go directly toward forward propulsion.

-  New 8D batteries x3  2018 ($2.5k)

-  Upgraded engine parts to 2018 manufacture standards 2018  ($4k)

-  Added radar and replaced original chartplotter with new 2018   

-  Replaced salon carpeting with Lonseal flooring 2018 

-  Added V berth carpeting and new mattress 2018 

-  Added cockpit seat 2018 

-  Added salon cabinet w/countertop and drawer and microwave 2018 

-  Added fixed mounted fire extinguisher in engine compartment 2018 

-  Dripless Shaft Seal replaced 2025

-  New Raw Water Pump 2026

-  New Fuel cooler 2026

The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.