Next week I am going on a big vessel (with a fish factory, 30x person crew, etc) and I am wondering if it is a good idea to bring my Mavic Pro.
Will the metal from the vessel interfere with the drone? Will I lose it easily if I fly while is moving? Does wifi work better in that situation? (big metal body interfering)

Personally, I would not dare take the chance. We know that metal has the effect and in my world it doesn't matter if the metal is your floor and walls or if it is embedded in concrete in a driveway.

In theory OPTI flight mode should still allow controlled flight ... BUT the space should be large enough and well lit but no bright reflections. Also the surfaces around need to be clearly textured with enough contrasting random patterns, and flat with no carpeting. You still could get heavy EM disruption in that enclosed space from all manner of things - active radar, strong magnetic fields will mess up the compasses etc. OPTI and ATTI mode are automatic so you won't be able to force OPTI mode and if it slips into ATTI it could be hard to control with ambiguous reflected signal coms to and from the RC unit.

I've flown over large metal objects which caused compass errors.  When the distance increased the errors went away.  The risk is loosing TX connection as the Mavic will RTH and land in the ocean 'cause the ship has moved.

I'd say its risky...

I fly from a steel motor yacht.
I tried  a take off from a teak covered deck and was particularly lucky not to loose the drone due to compass errors making the lift off  very erratic.
you almost certainly will have to hand launch & hand land.

for a launch I await a full sreen GPS lock , then start props hold a full arm up, have craft facing away , so I can fly up and away from the boat, without hitting the mast.

Recovery will be a bit of a problem, something I have only done at anchor as effectively you will need to fly along while landing.

In a nut shell difficult, particularly if you cant stop the boat.

I havent yet mastered the land while moving, and have only practiced it from a rib.

Lastly but far from least, dont forget the aparrent wind speed , 10knot boat going into a 15 knot wind = 25 kn.  all of a sudden getting back to the boat might be problematical.

Take drone  for some harbour shots at start and end. will be worth it for that alone.

Also, if you plan on flying while the boat is moving, that'll bring in several other problems.  I personally would not do it.  Get an Osmo Mobile.  Mine is a GREAT alternative to use when flying my Mavic isn't optimal.

Ok thanks everyone, sounds too risky. I agree now. I will evaluate the situation once in the vessel but I am prone to follow the general advice.

Yachtsman Posted at 2018-2-22 08:49
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Awesome, did you took off from the boat?

Yachtsman Posted at 2018-2-22 08:49
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Nice shot!      

eried Posted at 2018-2-22 10:56
Ok thanks everyone, sounds too risky. I agree now. I will evaluate the situation once in the vessel but I am prone to follow the general advice.

Taking off and Landing from hand. Find place on open deck without obstructions. Wait for wind less than 10knots. Compass error apears often. Hard but possibile to do. I się it few times, always stressful flights. Gl

djiuser_l1Ugovwa1dOP Posted at 2018-2-22 13:21
Taking off and Landing from hand. Find place on open deck without obstructions. Wait for wind less than 10knots. Compass error apears often. Hard but possibile to do. I się it few times, always stressful flights. Gl

One more thing, sensors switched off

djiuser_l1Ugovwa1dOP Posted at 2018-2-22 13:25
One more thing, sensors switched off

Which sensors? Frontal collision?

no downward position system and set dynamic homepoint on ,if sensors are off you can easier land on your hand and it's safer hover low on the water.

As Jos A said. Also I read somewhere that mavic uses them to stabilise position in the air? If so, then moving vessel may fool it.

Yachtsman Posted at 2018-2-22 08:17
I fly from a steel motor yacht.
I tried  a take off from a teak covered deck and was particularly lucky not to loose the drone due to compass errors making the lift off  very erratic.
you almost certainly will have to hand launch & hand land.

10 into 15 is a 5 ..... too easy... I'd land in the push pit...

eried Posted at 2018-2-22 12:18
Awesome, did you took off from the boat?

Yup  standing on the little deck on the bow, which has no wires to fly into.
Would like to have taken a more side on picture, but right at the edge of a very correct no fly zone.

A CW Posted at 2018-2-22 12:20
Nice shot!

Thank you for your comment.

Lamplighter55 Posted at 2018-2-22 03:35
In theory OPTI flight mode should still allow controlled flight ... BUT the space should be large enough and well lit but no bright reflections. Also the surfaces around need to be clearly textured with enough contrasting random patterns, and flat with no carpeting. You still could get heavy EM disruption in that enclosed space from all manner of things - active radar, strong magnetic fields will mess up the compasses etc. OPTI and ATTI mode are automatic so you won't be able to force OPTI mode and if it slips into ATTI it could be hard to control with ambiguous reflected signal coms to and from the RC unit.

The worse problem by far is compass reliability.  Regardless of mode, signal strength, GPS or ATTI/OPTI, the flight control system will not be able to manage/control the drone's direction and erratic flight will occur.

Be aware when landing you vessel has to stop completly, otherwise it is difficult to land and grap your mavic

Jos A Posted at 2018-2-23 06:20
Be aware when landing you vessel has to stop completly, otherwise it is difficult to land and grap your mavic

Exactly, the same reason i always wait for good weather conditions - sea wave height less than 2 m, wind less 10 knots and ship stopped. Imo landing is the most difficult part.

I ended flying it in the moving vessel. It was quite exciting and hard. It is weird to have a log where I land without going back

eried Posted at 2018-2-26 16:15
I ended flying it in the moving vessel. It was quite exciting and hard. It is weird to have a log where I land without going back

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Great pictures well done.

did you get compass errors as you landed?

Yachtsman Posted at 2018-2-27 10:58
Great pictures well done.

did you get compass errors as you landed?

Yeah, all the time, magnetic interference, compass error, gps, etc

One thing people forget is that the definition of hover generally means the aircraft is stationary with respect to the earth, NOT the controller.  If you are moving and put it in a true hover, you'll run into a wall when inside.