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2011 ISA 50M

Toulon, France


The 50m (164ft) motor yacht Liberty was delivered by ISA Yachts in 2011. The yacht's interior was designed by Rene Van Der Velden and her exterior styling is by Andrea Vallicelli. Fully stabilized and capable of speeds in excess of 15 knots, she is comfortable, fast and remarkably fuel-efficient.


The interiors by Rene Van Der Velden were inspired by the ocean, as evidenced in the main deck’s coral-themed dining area and there is a Zen-like atmosphere throughout thanks to soft, neutral tones, and lots of light wood.


Timeless styling, beautiful furnishings, and sumptuous seating feature throughout to create an elegant and comfortable atmosphere.


Liberty was built to MCA and Lloyds Register standards, completing her 10-year special class survey in 2021. Liberty was designed to be a successful charter vessel from build and, as such, has built up an impressive reputation within the charter market.


Approved Boats is pleased to assist you in the purchase of this vessel. This boat is centrally listed by Northrop and Johnson (Monaco).

Basic Boat Info

Tax Status: Not Paid
Boat Name: Liberty
Make: ISA
Model: 50M
Year: 2011
Condition: Used
Category: Power
Construction: Steel
Boat Hull ID: ISA500012011
Has Hull ID: Yes
Range: 8,148.8 km


Length: 163'9 ft / 49.90 m
Length Overall: 164'0 ft / 49.99 m
Waterline Length: 140'1 ft / 42.70 m
Beam: 29'6 ft / 9.00 m
Range: 26'11 ft / 8148.8 m
Max Draft: 8'4 ft / 2.55 m
Min Draft: 8.37 ft
Cabins Count: 6

Engines / Speed

Engines: 2
Engine #1 Specs:
  • Make: MTU
  • Model: 12V 4000 M71
  • Fuel: Diesel
  • Engine Power: 1,850kW
  • Type: Inboard
  • Year: 2011
  • Engine Hours: 5420
  • Engine Location: Port
Engine #2 Specs:
  • Make: MTU
  • Model: 12V 4000 M71
  • Engine Power: 1,850kW
  • Type: Inboard
  • Year: 2011
  • Engine Hours: 5492
  • Engine Location: Starboard
Total Engine Power: 3,700kW
Cruising Speed: 12 kn
Maximum Speed: 17 kn


Heads Count: 8
Boat Class: Mega Yachts



LOA: 164' (49.99m)

LWL: 140’ (42.7m)

Beam: 29' 6" (9m)

Draft: 8’ 4” (2.55m)

Builder: International Shipyard Ancona

Year: 2011

Hull Material: Steel                                                                                                                  

Superstructure: Aluminium

Gross Tonnage: 495 GRT

Displacement: 416 Tons

Net Tonnage: 148 Tons

Range: 4,400 nm

Int Designer: Rene Van Der Velden

Ext Designer: Andrea Vallicelli

Naval Architect: ISA Technical Department

Flag: Cayman Islands, George Town

Guests: 13 in 6 staterooms

Crew: 11 in 6 cabins

Classification: Lloyds 100A1, SSC, Yacht LMC UMS,MCA Compliant, LY3

Build Number: ISA 500.01

Tax Status: Ex. VAT




Liberty can accommodate 13 guests across six cabins, each designed to a different maritime theme – tortoise, seahorse, shark, nautilus, shrimp, and starfish and coral.

The guest accommodation comprises of a full beam master cabin, which has a spacious ensuite, large storage spaces, private office, and relaxation space. There is a VIP cabin with a queen double on the bridge deck with the remaining cabins located on the lower deck. The lower deck cabins are comprised of two double queen cabins aft and two twin cabins forward, one with a pullman.

There is space for 11 crew across 6 crew cabins to ensure that guests receive the best service whilst onboard.


Engine Room & Machinery

Engines: 2 x MTU 12V 4000 M71, 1850 kW (3,700 kW Total) @ 2,000 RPM

Engine Hours (Port / Starboard): 5,420 / 5,492 (29th June 2023)

Stabilizers: Quantum Zero SpeedCruising Speed: 12 knots

Max Speed: 17 knots

Consumption: 220 L/H @ 1270 RPM (12 knots)

Range: 4,400 nm @ 11 knots

Generators: 2 x Northern Lights M1066H 155kw 400V

Generator Hours (Port / Starboard): 14,477 / 14,976 (29th June 2023)

Voltage: 400V, 50 Hz

Exhaust mufflers: Aqualift

Bow Thruster: 84kW Schottel STT 110

Propeller: 1 x Five blade Schaffran

Gear Box: 2 x ZF 76000

Steering System: 2 x Van der velden hydraulic unit

Rudders: 2 x Rudders with Duplex Shafts

Fuel Capacity: 87,000 L (23,088 US Gal)

Water Capacity: 20,000 L (5,283 US Gal)

Water Maker: 2 x HEM 30 - reverse osmosis systems – 12,000ltrs/day each

Sewage Treatment Plant: Hamman

Air Conditioning: Condaria, Fan coil HVAC


Electrical System

Electrical Power: 400v AC / 50 Hz 3 Phase

Batteries: 34 x 12V

Battery Chargers: 12V 35 Amp

Shore Power: Output 126 kVA, 200 / 400 VAC – 50 Hz / 2 x 91A

Transformers : 2 x A/SEA convertors VOLTAGE: 400 V /50HZ


Navigation Systems

Inmarsat C Satellite Communication: 1 x SAILOR TT3606E Inmarsat C GMDSS (C/LRIT and C/SSAS), Thrane & Thrane

Telecom Systems: 1 x VOIP lines over VSAT (Milano Teleport) Telephone Exchange and 1x Panasonic Central Unit KXTDA - 30 for 24 stations and 8 outside lines providing internal communication system on board (Panasonic PABX)

VHF:     2 x Sailor Radio (SAILOR) VHF RT with DSC A Type RT-6222

Intercom Portable VHF:8 x Icom IC-M87 VHF Sets with chargers / Channel 88

Portable GMDSS VHF: 2 x Saillor SB 3520 with spare batteries

EPRIB: 1 x SAILOR 4065 GNSS AUTO, beacon unit / 121.5 & 406 MHz,


Navtex Receiver: 1 x Furuno Navtex Receiver NX 700 (display with built in printer)

GMDSS Battery Plant: 1 x 24V GMDSS Power Supply Unit with monitoring interface into PLC

GMDSS Network: 5 x GMDSS Network switch

 Navigation Bridge: Integrated Navigation Bridge with 2 wing stations (PORT & STBD)

2 x LED RED Light for night operations on charts and route monitoring

Screens: 5 x TFT Hatteland 19 inch screens

1 x 16-inch screen for MTU ECU

Radar: 2 x X-Band Radar / Furuno FAR 2117 Black Box Version / 96NMs Operator panel with tracker ball

Gyro interface for GPS & ECDIS / 6.5Mtr Scanner / ARPA Module

ECS: 2 x Transas 4000 ECS Units (independent) interfaced with two separate screens in bridge

Licensed World Folio with Radio Holland & updates from Wartsila Inc.

UPS: 1 x UPS 3000VA (EATON 3150)

Magnetic Compass: 1 x Spherical Magnetic Compass VENUS

1 x Electronic Magnetic Fluxgate Compass with NMEA0183 interface

Gyro Compass:  1 x Gyro Compass System NAVIGAT X MK2, Mod

1 x Console Repeater Compass 360/10, Sperry Marine

1 x Digital Repeater, Sperry Marine

Autopilot: 1 x Navipilot 4000 Microprocessor controlled digital fully adaptive self-turning heading unit

Rudder Angle Indicator System:4 x Rudder Angle Indicators, Sperry Marine

Sonar: 1 x Forward Looking Sonar FAR500 with control interface on bridge ECS Monitor

Echo Sounder: 1 x Wheelmark approved dual channel navigation echosounder GDS 102

Speed Log: 1 x Sperry Naviknot


AIS: 1 x Furuno FA 150 Universale AIS

Wind Instruments: 1 x B & G H3000

Horn: 1 x Kahlenberg airhorn Model T1

Windscreen Wipers: 5 x Marine type Holles 235 KS Wipers / 2 speed 24V DC motors

Searchlights: 2 x Sanshin 24V DC, ARC/RCL 600 – 24V DC

Sextant: 1 x Cassens & Plath Sextant Horizon with case

Pelorus: 1 x Cassens & Plath “SEA” Model Pelorus with case

Bridge navigational watch alarm: 1 x Watchkeeper PIR module / 24V DC

VSAT: Seatel 5004

Wifi: 3 x Pepawave Shore Wifi & 4G Router


Galley / Laundry / Domestic

4 x Induction cooktop   

1 x Electrolux Electric Grill and hot plate

1 x Oven, Rational Combi master steam oven

2 x Electrolux conventional Electric fan ovens

1 x Miele M8261-2

1 x Deep fryer, Electrolux

1 x 600Ltr Freezer / Fridges

1 x Dishwasher, Project jet 500+

1 x Extraction Hood, SS Custom built

2 x Dishwasher, Miele G7856 AE WES

2 x Microwave, Miele M8261-2             

2 x Winecooler, Eurocave Compact 59

1 x Coffee Machine, Saeco Exprella

2 x  600Ltr Freezer / Fridges, UNIFRIGOR

2 x Washers, Miele Professional PW 6065 Plus 2 x Dryers, Miele Professional 1 x GT10 1 x GT08

1 x Ironing Machine

1 x Customer electric BBQ grill Custom Made (500 x 460)

2 x Miele C3 Hoover



21ft (6.4m) Castoldi LC Jet Guest Tender

15ft (4.5m) Zodiac with 40hp outboard

Sea-Doo GTX Ltd (2018)

Yamaha Cruiser FXHO WaveRunner (2018)


Deck Equipment

Anchor Windlass: 2 x fwd, Muir/ reversing motor

Warping Capstans: 2 x aft, Muir / reversing motor

2 x Original Pool High Holding Power Anchors type ‘N’ fully welded & execution fully balanced, 315 kg each, Finish Galvanised

2 x Lengths of 4.5 shackles studlink chain with diameter of 19mm Each total length has two end links, a swivel plate & an anchor D Blot Each anchor has a stainless steel plate welded to the bottom

Crane: MOB boat hydraulic crane, SWL 550 kg, Cramm

Passerelle / Boarding Ladders: 1 x Hydraulic telescopic passerelle, SWL 250 kg, Cramm    

1 x Hydraulic ladder on starboard, SWL 170 kg, Cramm

1 x Manual Marquip ladder for crew on port side and starboard Removable, sockets (Multiplex system) on the stern hatch platform

Underwater lighting: 18 lights


Audio Visual Equipment and Deck Facilities:

Zappiti movie server connected to TVs in all cabins.

Apple TV & Apple airplay throughout the yacht.

Playstation with virtual reality

Sat TV, Sky subscription

All systems controlled by i-Pads

100" outdoor movie screen and projector that can be installed on bridge deck aft or sundeck.

Denon and Marantz amplifiers throughout the guest areas, all Bluetooth connectable.

B&W speakers throughout. All updated and renewed in 2018.


Fire & Safety

Hi-Fog: Marioff Hi-Fog SPU

NOVEC 1230 – 51.5 Kg for ER

Portable FFE spread across the yacht as per LY3 regulations

Breathing Apparatus: 2 x SCABA sets + 4 Spare Bottles

Gas detection: Smoke & Gas detection – Honeywell Sensors

Galley: CO2

Lifejackets: 4 x inflatable & 26 foam

Life Rafts: 3 (16 PAX Zodiac Oceangoing A Type)


Immersion Suits: 26

Life Rings: 6


Refit Works

Shipyard period every winter for regular maintenance and renovation when needed. 10-year survey completed May 2021.

Works completed over Winter 2020/2021:


- New carpet fitted throughout the interior - All new linen

- All new Cashmere blankets


- Completed full overhaul of main engines - Full overhaul of generators

- All pumps replaced

- Stabilizers updated with latest Quantum parts for quieter performance


Specifications and details of this vessel are provided in good faith for informational purposes only. Data regarding the specifications, operating characteristics and condition of the vessel was obtained from sources believed reliable but is not guaranteed by owner or brokers. Buyer assumes responsibility to verify all speeds, capacities, consumptions and other measurements contained herein and otherwise provided and agrees to instruct his agent or surveyor to confirm such details prior to purchase. Vessel is offered subject to prior sale, price and inventory changes and withdrawal from market without notice.


Engine hours are as of the date of the original listing and are a representation of what the listing broker has been told by the owner and/or actual reading of the engine hour meters. The broker cannot and does not guarantee the true hours. It is the responsibility of the purchaser to verify engine hours, warranties implied or otherwise, and major overhauls as well as all other representations noted on the listing brochure.

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