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Old 05-09-2018, 23:19   #1
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What is “Heave” on my Raymarine system?

Installed a new Raymarine autopliot and instrument pack. Playing with the i70s screen (which is fun!) and looking at all the different data points I can display.

There are a bunch under “Boat” such as Pitch, Roll, etc that are no doubt coming from the EV-1 sensor core in the autopilot system.

However, there is one in there called “Heave” which is measured in metres. What is this exactly? Can’t find any reference in the manual.

My guess, it’s the amount the boat is moving up and down due to swell, and used depth sensor to calculate. Am I right?

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Old 05-09-2018, 23:59   #2
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Re: What is “Heave” on my Raymarine system?

You are correct in your first supposition, but your second one is doubtful.

A vessel has axial motion (ie rotation) in three directions, pitch(front to rear), roll (side to side) and yaw(turn to port/starboard).

It also has translational motion (i.e. linear movement) in three directions heave(up and down), surge(forwards and backwards) and sway( sideways).

Systems may use GPS, depth sensor, accelerometer or a combination of these methods to determine heave.


The EV-1 has a 3-axis digital accelerometer as well as 3-axis digital compass and 3-axis gyro digital angular rate sensor, so I would expect it to be using the accelerometer.
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Old 06-09-2018, 00:34   #3
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Re: What is “Heave” on my Raymarine system?

Thanks Stu

I am getting a “- - -“ reading for Heave at the moment. I am in deep water (ie no depth reading) which is why I thought it might use the depth sensor. Will see if I get a heave reading once back in shallower water
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Old 06-09-2018, 00:37   #4
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Re: What is “Heave” on my Raymarine system?

I think the Australian Ray marine software word is chunder....
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Old 06-09-2018, 00:45   #5
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Re: What is “Heave” on my Raymarine system?

Quote:
Originally Posted by weavis View Post
I think the Australian Ray marine software word is chunder....

That's the Bruce marine word


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Old 06-09-2018, 00:49   #6
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Re: What is “Heave” on my Raymarine system?

I had forgot that sketch...........still as fresh as the day it was filmed.
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Old 06-09-2018, 10:39   #7
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Re: What is “Heave” on my Raymarine system?

And here I thought that it was the result of eating too much ho...and cleaning-up of the Raymarine system would be required...
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Old 14-09-2018, 08:12   #8
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Re: What is “Heave” on my Raymarine system?

Well, been sailing around in shallower waters and my heave reading is still “- - -“ so it doesn’t appear to come from the depth sounder or the EV-1.

Surely it doesn’t need gps? I wouldn’t think gps had the accuracy for this?
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