Merra Sea Trial

Neutral

Rudder 0°

CAPSIZED

What happened

A simplified teaching model of a generic 10 m creel boat – not an assessment of any real vessel.

HARBOUR MARK REACHED

PROPELLER FOULED

With a rope round the propeller she has no drive and is lying to her own gear. In reality the fleet can hold the stern down in a sea, and someone has to go over the side or the boat needs a tow. Keep the rope out on the starboard side and clear of the stern, and take her out of gear whenever the rope or the buoy comes near the propeller.

Plotter – track and gear

Try it on your phone

Scan with a phone's camera to open Live Attitude: tilt the phone and the creel boat follows. It uses the phone's own motion sensors, with no app to download.

QR code for seatrial.merra.org/attitude.html

seatrial.merra.org/attitude.html
To keep it as an app: iPhone – Share › Add to Home Screen; Android – ⋮ › Install app.

PAUSED

CARRY ON?

Helm

Rudder

0° Throttle

55% Speed

0 kn Over ground

0 kn

Phone used as

RudderThrottle

Fishing trip

Fleet, crew and hauler settings (apply on restart)

Creels in fleetSpacing m Depth mCreel kg End weight kgEnd section m Handling s/creelHaul speed m/s Hauler max pull kgEndline × depth

Crew work automatically (hook the buoy as soon as it is in the pick-up zone at 0.5 kn or less, restart the hauler after each creel)

Hauler relief valve lets rope run out at max pull

Fleet lies

Plotter – track and gear

Scroll to zoom, drag to move, double-click for the whole trip.

Deck layout – creel stack and deck tank

Deck tank (live catch)

Size××m Water

Drag the creel stack or the tank on the plan. The tank's weight of water, how high it sits and how far it is off the centreline or aft all change the list, trim and stability straight away.

Standing list Trim GM Aft freeboard Deck load Tank surge costs

Why it rolls – righting lever (GZ)

Roll · last 30 seconds

Sea, wind and task

	Height m	Period s	From °	Irregular

Windkn from° gusts%

Tidekn setting towards°

Creels on deck at start

TaskSea no.

Sim speed

Height is the significant wave height for irregular seas, or crest-to-trough height for a regular swell. Directions are where the waves or wind come from; the tide is given the way it is going.

Data

Records the run at 10 samples per second.

Merra Sea Trial is a teaching simulator of a generic boat, not a stability assessment of any real vessel. · About
© Coastal Resources Management Group Ltd · merra.org