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Raymarine forum / Raymarine Forums / Autopilots v / A78 - possible GPS issues

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A78 - possible GPS issues
05-09-16, 08:09 AM
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silverbullet87 Offline
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A78 - possible GPS issues
I'm running an A78 on a 25ft grady white with a raymarine radome. I've noticed a large dependency between stationary targets my radar picks up vs. their location on my charts. My charts are up to date navionics charts. As you can see in the attached pictures - radar targets vs charts do not agree. I feel like the radar is accurate - and the charts are off for a few reasons.

I've tried heading straight towards a bouy or other stationary item. The radar shows it on my heading line as it should - but the chart will show it quite a way off to the right. As i get closer - the chart and radar seem to agree more.

I've also noticed when i'm going through a somewhat narrow canal - my track from earlier in the day (heading out to fish) will be significantly off. The track will be on land.

I do have radar overlay switched to radar-chart synchronization. Any ideas?
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A78 - possible GPS issues - silverbullet87 - 05-09-16 08:09 AM

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