Diesel fuel
36 US gal
136 L total
Two 18 US gal tanks
The vessel / 2003 Gemini 105Mc
Get to know Mavis.
A practical cruising catamaran with a well-travelled history. Here are her details, the systems in her log, and the points that still need an onboard check.
At a glance
A Gemini.
Through and through.
Specifications supplied by the captain. Reported displacement and sail area are model specification figures. The final included inventory will be documented for buyers.
- Vessel
- S/V Mavis
- USCG documentation number
- 1252704
- Hull number
- #816
- Master
- Capt. FrankMavis’s third masterPurchased December 2017
- Manufacturer / model
- Performance Cruising Inc. (USA)
Gemini 105Mc - Length overall
- 33.50 ft / 10.21 mCaptain supplied specification
- Waterline length
- 31.75 ft / 9.68 mCaptain supplied specification
- Beam
- 14.00 ft / 4.27 mCaptain supplied specification
- Draft, boards raised
- 1.50 ft / 0.46 m (18 in)Captain supplied specification
- Draft, boards lowered
- 5.50 ft / 1.68 mCaptain supplied specification
- Displacement (reported)
- 8,000 lb / 3,629 kgCaptain supplied specification
- Sail area (reported)
- 690 ft² / 64.10 m²Captain supplied specification
- Vessel build year
- 2003Captain supplied specification
- Hull / rig
- Catamaran / twin centerboardsMasthead sloop
- Construction / designer
- FiberglassTony Smith
- Model production
- 2003–2011
- Location
- Long Island, New York
- Sale inquiries
- For sale by ownerCapt. Frank · operator, maintainer & sales contact
- Asking price
- Price on request ↗
- Engine hours
- 2,520 last loggedJuly 11, 2026 · current hours to be confirmed
For the longer voyage
Tankage & capacity.
The practical numbers for extended cruising, confirmed by the captain.
Fresh water
60 US gal
227 L total
Two 30 US gal tanks
Holding tank
18 US gal
68 L
Waste holding capacity
Hot water
6 US gal
23 L
Water heater capacity
Propane
2 × 20 lb
9.1 kg per cylinder
Two propane cylinders
Volumes are in US gallons; litre conversions are rounded. Water-heater capacity is listed separately from the fresh-water tanks.
The Gemini 105Mc arrangement
Cabins & cruising comfort.
View the full drawing ↗
The standard three-cabin layout places the master cabin forward, with a double cabin aft in each hull. A central saloon connects to the cockpit. Current photographs and the walkthrough will show Mavis’s interior in detail.
- Cabins
- Three private cabinsForward master cabin and two aft cabins
- Sleeping berths
- Six in the cabinsThree double berths
- Saloon
- Central dining areaConnected to the cockpit
- Galley
- Starboard hullSeparate from the central saloon
- Head
- Forward in the port hullEnclosed head and shower space
Published model figures
The rig dimensions.
- Mast clearance
- 46 ft / 14.0 mPublished model figure; Mavis’s actual clearance with masthead equipment to be confirmed
- Mainsail area
- 340 ft² / 31.6 m²Published Gemini 105Mc sail area
- Genoa area
- 350 ft² / 32.5 m²Published Gemini 105Mc sail area
- Screecher area
- 420 ft² / 39.0 m²Published Gemini 105Mc sail area
The reported 690 ft² working sail area combines the mainsail and genoa. The screecher is a separate sail. These dimensions come from the builder’s Gemini 105Mc owner’s manual.
An open conversation
The vessel notes.
Sillette Sonic drive
In working order.
A rebuilt spare assembly is also part of the preliminary inventory.
Looking ahead to spring 2027. Mavis is scheduled for her regular winter overhaul, with cruising readiness planned for spring 2027.
Specifications and included equipment are being reconciled with current onboard checks. Historic photographs show Mavis during earlier voyages, rather than her present condition.
The maintenance timeline records work done at specific dates. It does not imply that equipment is presently installed or fully operational. Current engine hours, rigging history, sails and the included inventory can be discussed with the captain.
Ask a technical questionThe working details
Systems & equipment.
Mavis comes with an extensive cruising inventory: spare propellers, extra electronics, a Magma grill, diesel cans, water cans and cruising gear. The systems below combine current details from the captain with their documented installation history.
Propulsion
Beta Marine 30 diesel
Repower recorded November 7, 2018. Last logged reading: 2,520 hours on July 11, 2026; current reading to be confirmed.
Recorded installationSillette Sonic steerable drive
In working order.
Confirmed by captainPRM transmission
Repower entry lists PRM 90; the 2020 replacement entry lists PRM30. Installed model requires confirmation.
To be confirmedRebuilt spare drive assembly
Reported rebuilt Sillette Sonic assembly, yoke and transom plate. Included inventory and condition require confirmation.
Owner reportedNavigation
Raymarine Evolution autopilot
p70s control head, ACU-100 and EV-1 sensor installation recorded March 12, 2025. Current operation to be demonstrated.
Recorded installationGarmin chartplotter & AIS
Garmin chartplotter documented; Garmin AIS800 replacement recorded July 11, 2026. Current configuration and operation require confirmation.
Recorded installationStandard Horizon VHF
GX2200 VHF/AIS receiver installation recorded January 20, 2018. Current operation requires confirmation.
Recorded installationElectrical
410 W Qcells solar panel
Replacement of the previous Grape Solar panel recorded November 14, 2025. Remaining solar inventory requires confirmation.
Recorded installationVictron charging & monitoring
BlueSolar MPPT 100/30 controller and BMV-712 Smart battery monitor recorded in 2023.
Recorded installation2,000 W pure sine wave inverter
Redodo 2,000 W pure sine wave inverter, installed December 10, 2023.
Recorded installation237 Ah AGM battery bank
237 Ah AGM house battery bank.
Confirmed by captainCruising comforts
Dometic AC / propane refrigerator
Runs on AC power or propane, supporting power-efficient extended cruising.
Confirmed by captainSails & rigging
Main, genoa & screecher
The original mainsail, genoa and highly desired screecher are serviceable and have been professionally maintained.
Confirmed by captainCruising inventory
Spare propellers & extra electronics
A substantial spares inventory, including spare propellers and extra electronics.
Confirmed by captainMagma grill
Magma grill included in the cruising inventory.
Confirmed by captainDiesel & water cans
Diesel cans and water cans included for extended cruising.
Confirmed by captainCruising gear
An extensive collection of cruising gear accumulated through years of cruising.
Confirmed by captainDocumentation
Vessel & systems reference library
A full library of reference materials for Mavis and her onboard systems.
Confirmed by captainAccommodations & the included inventory
A current walkthrough, cabin measurements and detailed equipment photographs are being assembled. Tank capacities are confirmed above. Contact Frank for the latest information and to discuss a viewing.
The invitation
Her next chapter.
Perhaps it’s yours.
A conversation is a good place to begin. Ask about the boat, talk through a system, or arrange to see Mavis in person.
Speak with the captain captain@sailingmavis.com