Question about Raymarine A65 Combo GPS Chartplotter/Fishfinder

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Raymarine A65 My A65 intermittantly freezes on the sonar side when the engine is started.  ferrites have been fitted.

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  • Seawatch Dec 28, 2007

    Thanks for the info, however, I have tried operating the system by utilising a stand-alone battery which was connected only to the GPS system but the problem still persists. I have not heard of the Newmar device or similar. I am UK based and I am guessing that you are US, that being the case, I will trawl the internet to see what I can find.

    I am most grateful for taking the time to come up with a suggestion, at least it does give me a possible way forward.

    I can be contacted direct on



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When the engine starts, there is a voltage drop as the starters crank, followed by a power surge as the alternators kick in and the voltage comes back up.

Ferrites are only there to prevent RF (Radio Wave) interference from other onboard devices.

You should either:
-add an isolated battery to the boat to service only your electronics. That way it is unaffected by the starters.

-There are several devices on the market like Newmar Power's "Start-Gurad" that automatically switch electronics to backup power during engine start. They work great and the electronics don't skip a beat.

Posted on Dec 28, 2007


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Was the engine running when it shut off? How was the voltage at the time it failed? The A65 will shut down if the voltage drops below 11.2 volts.

Another common cause would be corrosion on the plug where it plugs into the back of the display, or the terminal connectors that attach it to the boat's power supply.

It could also be a bad crimp on the terminal connectors. Make sure connectors are the right size for the wire and that they are marine grade, such as Ancor brand connectors. I also recommend heat shrink style connectors,

I have not heard of any software issues for that model so I am betting it's a wiring issue. However, there is an update available from Raymarine. There were changes made to the WAAS satellites and the update helps it recognize the new satellites. You can download it for free from Raymarine. Copy it onto a blank CF card and plug it into the card slot on your GPS. When you turn the unit on it will prompt you on how to proceed with the update. It will fix any known software gliches at the same time.

I hope this answer helps. Please reply if you have any questions about my response.

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