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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics
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  #1  
Old 08-19-2010
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Multi-display Boat Icon is Slightly "Off"

Hi all,

I just returned from a couple of days with my family at Santa Cruz Island. I noticed that when I set waypoints and follow the track, I am off a bit when I arrive. That seemed odd to me. When making my way to my slip I noticed that the boat icon in my display is not pointing in the exact direction of travel.

So even though I was going down the middle of a channel, it showed my boat facing about 15-20 degrees right while traveling down the middle of the channel. Does this make sense? So, thinking that the icon showed my actual orientation, I was always a bit 'off' when heading towards a waypoint.

I'll have to dig out the two-volume manual and see what it says. Has anybody else run into this?

Thanks as always, Bill
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  #2  
Old 08-20-2010
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Forgot - Raymarine C-80 Gear

Oops, forgot to tell you what type of instruments. All Raymarine, C-80 chartplotter and radar.

Thanks, Bill
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Old 08-20-2010
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This may have nothing to do with your problem but I had something similar happen to my Garmin in my auto. I noticed that it lacked some detail and auto icon was showing to be about a hundred or so yards off the highway / roads.
It also stopped identifying the roads to turn on, it simply gave the direction to turn instead of saying "turn left" etc.

The night before I had been browsing the different settings and evidently I had unchecked the "US maps" which was the only map showing in the memory. Even though I had unchecked it, many of the main roads were still showing on the screen but everything was slightly off.

After I checked that map again, everything returned to normal.
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Old 08-20-2010
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Quote:
Originally Posted by montenido View Post
So even though I was going down the middle of a channel, it showed my boat facing about 15-20 degrees right while traveling down the middle of the channel. Does this make sense? So, thinking that the icon showed my actual orientation, I was always a bit 'off' when heading towards a waypoint.
Sounds like it might be a Display Setting - Head Up or Course UP or North Up.
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Old 08-20-2010
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One thing, in many cases, computer screens, like a chartplotter, generally don't have the resolution to have the icon point in EVERY DIRECTION very clearly...so only give you a general idea of what direction the boat may be pointed in. The icon may only actually be shown pointing in 8 or 16 positions, and that could be the reason for the discrepancy.

@ChristyLeigh—

We hailed you a couple of weeks ago when Denby and I were out on s/v Slight Breeze and you didn't answer... very disappointed...
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Old 08-21-2010
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Do you have a fluxgate compass or another heading sensor in your system?
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Old 08-21-2010
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You may need to re-calibrate your fluxgate compass. We had a similar situation a couple of years ago when our Raymarine RL70C+ had some sort of electronic “burp” and the display showed our boat being towed around almost backwards. I tried to re-calibrate according to the instructions in the manual, but the system wouldn’t let me do it. Involves putting the system in a calibration mode and going out and doing 2 360’s.




I tried to get help from Raymarine over the internet, and then talked to their rep at the Seattle Boat Show. I finally got a hold of a tech that knew something about these ancient (8 year old) systems and he sold me a reconditioned ST6002 autopilot control head, instead of the ST6000 that came with the boat. This was a great upgrade because it not only allowed the calibration to proceed, it also displays the compass heading.

Hope this helps

Tom
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Old 08-23-2010
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I think the previous posts have it - my E80/E120 will do the same if the Autopilot fluxgate is not quite calibrated (it seems to need a cal "reminder" once in a while) - or it can be normal if your chart is set for Course Up, and current or wind is pushing you to one side - the boat may actually be pointing (heading) out of the channel yet still moving (COG) in the desired direction. We sailboats spend a lot of time pointing where we are not going.

But check your compass cal.
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Old 09-05-2010
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Thanks for the great replies. I haven't been back to the boat in a couple of weeks (don't ask), but will check the compass and calibration this week.

Thanks again, Bill
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