Philosophy of redundancy

If cruising in Pacific waters outside the hurricane season for up to 6 months, a yacht has to be self supporting and resilient to all conditions. Therefore on board of Alexandra none of the vital systems can be a ‘single point of failure’. This means there is always at least one backup/secondary system available when the main/primary system fails.

Multiple systems are:

  •  Many independent GPS receivers (Garmin, Magellan Meridian and 2 tablets, 2 phones)
  • 2 fully independent ways of position information (GPS, Sextant)
  • 3 compasses (B&G, Sestrel Moore)
  • 4 ways of weather information (Inmarsat-C, Pactor SSB, weather fax, voice SSB)
  • 2 barometers (1 barograph, 1 clock
  • 3 brass shipclocks
  • VHF transceivers (Icom)
  • SSB voice receivers (Icom M710)
  • 2 Stationary for navigation (2 with OpenCpn and CMAP) (note: 2 stationary computers  included in sale)
  • 2 ways of e-mail connection on high seas (Inmarsat-C, Pactor SSB)
  • 2 satelite emergency beacons (Inmarsat-C, 406 EPIRB)
  • 2 ways of emergency flares (Flaregun, handheld flares)
  • 4 diffent bilgepumps (Automatic electric, manual, high volume Jabsco, bailing buckets)
  • 2 autopilots (B&G, Navico WP5000)
  • speed sensors , GPS (B&G impellor)
  • 2 independent depth sounders (B&G , leadline)
  • manual steering by steering wheel, emergency tiller or autopilot power steering
  • 4 ways of battery charging (Yanmar alternators, 2x 220V chargers, solar power, towing generator)
  • multiple ways of starting Yanmar and Generator(Not operational) (emergency parallel switch, startercables)
  • 2 fridges (75, 90 ltr) and a separate 75 ltr freezer (Only one operational)
  • 2 heads (electric and manual)
  • 3 showers (each with mixing tap)
  • 3 ways of cooking ( LPG burners, LPG barbeque, Inductive 220V plate)
  • 2 composite LPG tanks 4kg & 6kg
  • Hot water cylinder (60 ltr) is heated either by 220V power and/or main engine coolant
  • 3 separate water tanks (180, 170, 220 liters)
  • 2 ways of  fresh water replenishment (desalinator, water catchments)
  • 2 separate dieselfuel tanks (2x 350 liters) and 60L daytank
  • manual and automatic electric fuel transferpump to refill the fuel daytank
  • 2 separate 150 ltr blackwater tanks (each with macerator pump and crossover connection)
  • 2 anchors (30 kg gen 4 anchor, 15 lbs Fortress)
  • 2 ways of electric hoisting of mainsail (Cockpit winch motor, anchorwinch capstan via snapblock)
  • 3 ways of closing and locking companion way (closed hatch, plexiglas, ventilation hatch)
  • 2 ways of MOB signalling (float with flag, dan buoy)

2 thoughts on “Philosophy of redundancy

    1. Maria Hammer

      It is important to have an extra system of all vital systems. We were happy having an extra autopilot several times when the main autopilot broke done.


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