Sealine 305 fly
Basic data
| Category: | Motorboat |
| Year of construction: | 1985 |
| Length: | 970 cm |
| width: | 305 cm |
| Depth: | 90 cm |
| Material: | Polyester |
| Motorization: | Volvo Penta |
| Berth: |
Dronten, Netherlands
|
Specifications
Sealine 305 Fly ready for new cruising plans
Anyone looking for a Sealine 305 Fly for sale will find in this 1985 classic a pleasant combination of space, visibility and relaxed handling. This Sealine is built by Fibrasonic Marine in polyester (GRP) and features a hard-chine hull, giving her a comfortable and predictable character on inland waterways, lakes and rivers. With a length of 9.70 metres and a beam of 3.05 metres, the boat feels spacious while still remaining manageable in marinas and at bridges. Air draft is approximately 4.00 metres and inside there is about 1.95 metres of headroom, making time on board comfortable even for taller people.
On board, it’s all about relaxed days on the water and practical amenities for holidays. The accommodation includes, among other things, a dinette, shower, refrigerator, oven, mattresses and hot water. The electric toilet does not discharge directly into open water and is connected to a 70-litre holding tank. Fresh water is supplied by a 100-litre water tank, with a pressurised fresh-water system (hydrophore) renewed in 2025. Hot water comes from a 40-litre boiler that can be used electrically and on shore power. Heating is provided by hot air via a 4 kW Eberspächer heater, extending the comfortable boating season.
Sealine 305 Fly now in the online auction. Everyone can bid up to and including 22 June 2026.
How does this Sealine 305 Fly handle with twin engines?
She is powered by two Volvo Penta AQAD30 diesel engines of 110 hp each, both inboard and electrically started. Twin engines often make manoeuvring calmer and more controlled, and this is complemented here by an electric bow thruster. The stated cruising speed is around 15 km/h and top speed around 35 km/h, making her suitable for both relaxed cruising and brisk passages. Engine hours are approximately 1,500 per engine. Instruments such as tachometers, oil pressure gauges, temperature gauges and fuel gauges are on board to maintain a clear overview underway.
Is she suitable for overnight stays and holidays?
Yes, this Sealine 305 Fly is set up for multi-day trips. She offers three fixed berths and two additional berths can be created. With amenities such as hot water, shower, a galley arrangement and refrigeration, it’s easy to spend longer periods on board. An extra plus is that the galley unit was renewed in 2025 by a marine carpenter, giving the living space a fresh and practical base for cooking and staying aboard.
What about tanks and energy on board?
For diesel there is a total tank capacity of 175 litres, supplemented by two plastic fuel tanks of 175 litres from 2025 and an additional 60-litre plastic tank from 2025 for the heater. Shore power is available on board, along with a battery charger and alternator. There are six batteries with a total capacity of 595 Ah, which is convenient for those who like to anchor for longer or stay in a quiet harbour without running everything on shore power. Navigation equipment such as GPS, depth sounder, compass, log and VHF radio is present, including a Simrad RS87 VHF with dual control.
Which equipment completes life on deck?
Outside she is equipped with, among other things, a bimini, cockpit tent, exterior covers, exterior cushions, guardrails, fenders and lines. The swim platform with swim ladder invites a dip on warm days, and the deck shower makes it easy to rinse off. Davits are fitted, useful for those who may later want to carry a tender. Anchoring is possible with a manual anchor windlass, an anchor and chain. An electric bilge pump is present for extra safety on board.
Are there any points of attention a buyer should know?
There is one known point of attention: there is play in the throttle lever of the port engine. Furthermore, it is stated that she has no osmosis or signs of osmosis. The boat was last taken out of the water for maintenance in 2026 and the last antifouling treatment was in 2025. Technical documentation is available, which is helpful for those who want insight into the installation and systems.
This Sealine 305 Flybridge combines the recognisable Sealine profile with a practical layout and equipment suited to leisure cruising and holidays. She is an inviting motorboat for anyone looking for a flybridge motor yacht with twin Volvo Penta diesels, bow thruster, heating and a comfortable living space. Through BoatAuction she now gets the chance to create many more great days on the water with a new owner.
VIEWING DAY INFORMATION
- The viewing day of this Sealine 305 fly is on Saturday 20 June 2026 van 10:00 until 12:00 in Dronten (NL).
ADDITIONAL INFORMATION
- We advise making use of the viewing day.
- The boat is in the water.
- This boat is registered in Netherlands under number 2-YF-367 and needs to be transferred.
- This boat is delivered without a trailer.
- This boat is sold under general auction conditions.
- This concerns a public auction, which means that the purchase cannot be returned based on the legal right of withdrawal.
| Brand | Sealine |
| Type | 305 fly |
| Length | 970 |
| Width | 305 |
| Depth | 90 |
| Clearance height | 400 |
| Year of construction | 1985 |
| Material | Polyester |
| Number of sleeping places (fixed) | 3 |
| Number of sleeping places (extra) | 2 |
| Standing height indoors | 195 |
| Last antifouling treatment | 2025 |
| Hull shape | Chine |
| Control | Wheel |
| Location control | Inside + Outside |
| Rudder | N/A |
| Shower | |
| Separate dining area | |
| Fridge | |
| Curtains | |
| Oven | |
| Warm water | |
| Water tank capacity in liters | 100 |
| wastewater tank capacity in liters | 70 |
| Toilet | Electric |
| Does the toilet drain directly into the open water | No |
| Heating | Hot air |
| Dinghy | No |
| Bilge pump | Electric |
| Weight (kg) | 6000 |
| Anchor(s) | 1 |
| Anchor attachment | Chain |
| Windlass | Hand |
| Bimini | |
| Outdoor cushions | |
| Davits | |
| Boat cover(s) | |
| Cockpit tent | |
| Fenders and lines | |
| Sea rails | |
| Swimming platform | |
| Swimming ladder |
| Number of engines | 2 |
| Start typing | Electric |
| Maximum speed | kilometers per hour | 35 |
| Engine type | Inboard |
| Brand motor | Volvo Penta |
| Model engine | AQAD30 |
| Power (hp) | 110 |
| Number of cylinders | 4 |
| Year of construction of the engine | 1985 |
| Engine hours | 1500 |
| Fuel | Diesel |
| Consumption | 4 |
| Tank capacity in liters | 175 |
| Fuel Tank Gauge | |
| Oil Pressure Gauge | |
| Temperature Gauge | |
| Tachometer | |
| Bow thruster | Electric |
| Number of batteries present | 6 |
| Total battery capacity | 595 |
| Battery charger | |
| Alternator | |
| Shore power | |
| 12V | |
| Is the engine operational - engine 2 | The engine is operational |
| Start type - engine 2 | Electric |
| Power - engine 2 | 110 |
| Number of cylinders - engine 2 | 4 |
| Year of construction engine - engine 2 | 1985 |
| Engine hours - engine 2 | 1500 |
| Fuel - engine 2 | Diesel |
| Consumption - engine 2 | 4 |
Sealine 305 Fly ready for new cruising plans
Anyone looking for a Sealine 305 Fly for sale will find in this 1985 classic a pleasant combination of space, visibility and relaxed handling. This Sealine is built by Fibrasonic Marine in polyester (GRP) and features a hard-chine hull, giving her a comfortable and predictable character on inland waterways, lakes and rivers. With a length of 9.70 metres and a beam of 3.05 metres, the boat feels spacious while still remaining manageable in marinas and at bridges. Air draft is approximately 4.00 metres and inside there is about 1.95 metres of headroom, making time on board comfortable even for taller people.
On board, it’s all about relaxed days on the water and practical amenities for holidays. The accommodation includes, among other things, a dinette, shower, refrigerator, oven, mattresses and hot water. The electric toilet does not discharge directly into open water and is connected to a 70-litre holding tank. Fresh water is supplied by a 100-litre water tank, with a pressurised fresh-water system (hydrophore) renewed in 2025. Hot water comes from a 40-litre boiler that can be used electrically and on shore power. Heating is provided by hot air via a 4 kW Eberspächer heater, extending the comfortable boating season.
Sealine 305 Fly now in the online auction. Everyone can bid up to and including 22 June 2026.
How does this Sealine 305 Fly handle with twin engines?
She is powered by two Volvo Penta AQAD30 diesel engines of 110 hp each, both inboard and electrically started. Twin engines often make manoeuvring calmer and more controlled, and this is complemented here by an electric bow thruster. The stated cruising speed is around 15 km/h and top speed around 35 km/h, making her suitable for both relaxed cruising and brisk passages. Engine hours are approximately 1,500 per engine. Instruments such as tachometers, oil pressure gauges, temperature gauges and fuel gauges are on board to maintain a clear overview underway.
Is she suitable for overnight stays and holidays?
Yes, this Sealine 305 Fly is set up for multi-day trips. She offers three fixed berths and two additional berths can be created. With amenities such as hot water, shower, a galley arrangement and refrigeration, it’s easy to spend longer periods on board. An extra plus is that the galley unit was renewed in 2025 by a marine carpenter, giving the living space a fresh and practical base for cooking and staying aboard.
What about tanks and energy on board?
For diesel there is a total tank capacity of 175 litres, supplemented by two plastic fuel tanks of 175 litres from 2025 and an additional 60-litre plastic tank from 2025 for the heater. Shore power is available on board, along with a battery charger and alternator. There are six batteries with a total capacity of 595 Ah, which is convenient for those who like to anchor for longer or stay in a quiet harbour without running everything on shore power. Navigation equipment such as GPS, depth sounder, compass, log and VHF radio is present, including a Simrad RS87 VHF with dual control.
Which equipment completes life on deck?
Outside she is equipped with, among other things, a bimini, cockpit tent, exterior covers, exterior cushions, guardrails, fenders and lines. The swim platform with swim ladder invites a dip on warm days, and the deck shower makes it easy to rinse off. Davits are fitted, useful for those who may later want to carry a tender. Anchoring is possible with a manual anchor windlass, an anchor and chain. An electric bilge pump is present for extra safety on board.
Are there any points of attention a buyer should know?
There is one known point of attention: there is play in the throttle lever of the port engine. Furthermore, it is stated that she has no osmosis or signs of osmosis. The boat was last taken out of the water for maintenance in 2026 and the last antifouling treatment was in 2025. Technical documentation is available, which is helpful for those who want insight into the installation and systems.
This Sealine 305 Flybridge combines the recognisable Sealine profile with a practical layout and equipment suited to leisure cruising and holidays. She is an inviting motorboat for anyone looking for a flybridge motor yacht with twin Volvo Penta diesels, bow thruster, heating and a comfortable living space. Through BoatAuction she now gets the chance to create many more great days on the water with a new owner.
VIEWING DAY INFORMATION
- The viewing day of this Sealine 305 fly is on Saturday 20 June 2026 van 10:00 until 12:00 in Dronten (NL).
ADDITIONAL INFORMATION
- We advise making use of the viewing day.
- The boat is in the water.
- This boat is registered in Netherlands under number 2-YF-367 and needs to be transferred.
- This boat is delivered without a trailer.
- This boat is sold under general auction conditions.
- This concerns a public auction, which means that the purchase cannot be returned based on the legal right of withdrawal.
| Brand | Sealine |
| Type | 305 fly |
| Length | 970 |
| Width | 305 |
| Depth | 90 |
| Clearance height | 400 |
| Year of construction | 1985 |
| Material | Polyester |
| Number of sleeping places (fixed) | 3 |
| Number of sleeping places (extra) | 2 |
| Standing height indoors | 195 |
| Last antifouling treatment | 2025 |
| Hull shape | Chine |
| Control | Wheel |
| Location control | Inside + Outside |
| Rudder | N/A |
| Shower | |
| Separate dining area | |
| Fridge | |
| Curtains | |
| Oven | |
| Warm water | |
| Water tank capacity in liters | 100 |
| wastewater tank capacity in liters | 70 |
| Toilet | Electric |
| Does the toilet drain directly into the open water | No |
| Heating | Hot air |
| Dinghy | No |
| Bilge pump | Electric |
| Weight (kg) | 6000 |
| Anchor(s) | 1 |
| Anchor attachment | Chain |
| Windlass | Hand |
| Bimini | |
| Outdoor cushions | |
| Davits | |
| Boat cover(s) | |
| Cockpit tent | |
| Fenders and lines | |
| Sea rails | |
| Swimming platform | |
| Swimming ladder |
| Number of engines | 2 |
| Start typing | Electric |
| Maximum speed | kilometers per hour | 35 |
| Engine type | Inboard |
| Brand motor | Volvo Penta |
| Model engine | AQAD30 |
| Power (hp) | 110 |
| Number of cylinders | 4 |
| Year of construction of the engine | 1985 |
| Engine hours | 1500 |
| Fuel | Diesel |
| Consumption | 4 |
| Tank capacity in liters | 175 |
| Fuel Tank Gauge | |
| Oil Pressure Gauge | |
| Temperature Gauge | |
| Tachometer | |
| Bow thruster | Electric |
| Number of batteries present | 6 |
| Total battery capacity | 595 |
| Battery charger | |
| Alternator | |
| Shore power | |
| 12V | |
| Is the engine operational - engine 2 | The engine is operational |
| Start type - engine 2 | Electric |
| Power - engine 2 | 110 |
| Number of cylinders - engine 2 | 4 |
| Year of construction engine - engine 2 | 1985 |
| Engine hours - engine 2 | 1500 |
| Fuel - engine 2 | Diesel |
| Consumption - engine 2 | 4 |
