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BigAl.NZ · 10-11-2018, 19:51

Hi,

I have a raymarine P70s (autopilot control head) and a i70s display.

I can't for the life of me work out why the wind indicator on them is (mostly) very different.

I have confirmed they are both set to apparent wind. They both use the same wind transducer which is via a ITC5.

I have also calibrated the paddle wheel at slack water (as apparently that is a factor in the calculations performed by the system).

The system is running lighthouse 3.6 or so - haven't got exact version on me now - but very recent. Even if the system was calibrated wrongly I would expect both would still display the same direction.

Here is a picture from earlier today.

What am I missing?

J.Kitchens · 10-11-2018, 21:36

1. Make sure the wind transducer is calibrated. It is pointless to work on this with an uncalibrated transducer.
2. Make sure they are both using the same source. Don't assume they are. The p70 can use the i70 or the ITC5. Try both in the p70; maybe one will work better than the other.
3. Make sure heading sensor is calibrated.

BigAl.NZ · 10-11-2018, 22:04

Quote:

Originally Posted by J.Kitchens

1. Make sure the wind transducer is calibrated. It is pointless to work on this with an uncalibrated transducer.
2. Make sure they are both using the same source. Don't assume they are. The p70 can use the i70 or the ITC5. Try both in the p70; maybe one will work better than the other.
3. Make sure heading sensor is calibrated.

Thanks. 1 & 3 have both been done but will retry.

Will also try 2 and report back.

BigAl.NZ · 11-11-2018, 00:11

I should add that the wind indicator on the i70s seems to follow the windex. Its the p70s I don't trust.

sailcrazy · 11-11-2018, 09:27

We, too, are using a P70S, and get some very strange wind and autopilot indications. After more than a couple exchanges with Raymarine tech personnel, they have concluded the problem is the compass sensor and its calibration. We have not had a chance to re-calibrate the heading sensor yet, but they seems convinced that if there is no metal/influence on the compass sensor a recalibration will fix everything.FWIW.

smac999 · 13-11-2018, 00:14

apparent wind has nothing to do with the heading sensor or paddle wheel. they don't need to exist or be calibrated to work.

for true wind they would need to be calibrated. but if they were not, you should still get the same number on both screens. it's just both would be wrong..

are you sure the left one is AWA? it does not say.
the 2nd photo has no wind on pilot screen.

does the wind speed and boat speed match on both screens?

you should be able to bring up like a 6 window data box on the pilot screen to show AWA, AWS, STW, detph. and see if they all match with other screen

smac999 · 13-11-2018, 00:18

Quote:

Originally Posted by sailcrazy

We, too, are using a P70S, and get some very strange wind and autopilot indications. After more than a couple exchanges with Raymarine tech personnel, they have concluded the problem is the compass sensor and its calibration. We have not had a chance to re-calibrate the heading sensor yet, but they seems convinced that if there is no metal/influence on the compass sensor a recalibration will fix everything.FWIW.

should be easy to tell if your heading is correct or not...

BigAl.NZ · 13-11-2018, 00:28

Quote:

Originally Posted by smac999

apparent wind has nothing to do with the heading sensor or paddle wheel. they don't need to exist or be calibrated to work.

for true wind they would need to be calibrated. but if they were not, you should still get the same number on both screens. it's just both would be wrong..

are you sure the left one is AWA? it does not say.
the 2nd photo has no wind on pilot screen.

does the wind speed and boat speed match on both screens?

you should be able to bring up like a 6 window data box on the pilot screen to show AWA, AWS, STW, detph. and see if they all match with other screen

Thanks - good suggestions. I will try this when next on the boat.

I rang RM today who confirmed that the iTC5 stores the calibration data for the wind sensor, so no calibration is required per display.

The RM tech was helpful and did suggest that I make sure the data source was set to Auto for both displays.

Will report back.

BigAl.NZ · 17-11-2018, 21:51

An update on this issue. Raymarine tech support tell me that the p70s always shows True wind.

The option to select True or Apparent in Wind vane mode is to do with the Autopilot in Wind Vane mode but doesn't change the wind icon to True/Apparent.

The full answer is detailed here : [TG11] p70s & i70s - wind

I will test this out when next on board.

FYI

AG