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Old 08-21-2017, 01:07 PM   #1
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The magenta line

OK, I know I'm not supposed to blindly follow the magenta line. Now I realize why.

This is right after the Moore Haven lock. Wonder why my chart is so far off. It's been like this a few times this trip. It's a Garmin 1040xs.

Does it need an update?Click image for larger version

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Old 08-21-2017, 01:13 PM   #2
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Nothing new there. Update won't fix it and it's not just Garmin, it's all of them.
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Old 08-21-2017, 01:24 PM   #3
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Same thing happened to me at the exact same place on my Simrad NSS16 Evo 2 using an updated Navionics chip.
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Old 08-21-2017, 01:28 PM   #4
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Huh. Interesting.

Thanks !!
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Old 08-21-2017, 01:49 PM   #5
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Maybe it's the eclipse. (Just kidding- it IS frustrating and you're not alone)

If you search around in The Hull Truth you'll find many, many similar complaints. Garmin isn't the only brand with negative reviews but they get a lot more comments because there are so many Garmin units out there. I have the same unit as you on my center console - it seems to be consistently accurate.

It may simply be that the "base information" about that area was wrong to start with. Or it could be the specific map. Is it a genuine Garmin map?
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Old 08-21-2017, 01:50 PM   #6
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I am often travelling over the marshes here in NE Florida!
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Old 08-21-2017, 02:15 PM   #7
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It has nothing to do with the magenta line and since the GPS is normally accurate to ten feet or so, it's the chart. And since the electronic charts are copies pf paper charts, it's the paper chart where the problem lies.

As boaters, we should be aware of where we are and rely on more than just our charts. Look up from the screen and follow the canal or markers and you'll be fine.
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Old 08-21-2017, 02:25 PM   #8
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Quote:
Originally Posted by WesK View Post
As boaters, we should be aware of where we are and rely on more than just our charts. Look up from the screen and follow the canal or markers and you'll be fine.
But but but... some people think that anything but electronic charts are DANGEROUS!!! What's a captain to do?!?!?



(FYI-the previous statement was meant as a sarcastic joke)
(these aren't the driods you're looking for)
(move along)
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Old 08-21-2017, 02:27 PM   #9
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Plus following the line can be hard on your prop.
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Old 08-21-2017, 02:30 PM   #10
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Yeah I've just using my eyes and lining up the reds and greens.

Just an FYI, right before the Monterrey bridge near Stuart, heading West, there was a floating red can and next to it my depth finder showed 1.2 feet under the keel. That seemed shallow.

Maybe it drug.
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Old 08-21-2017, 02:38 PM   #11
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My new Si-Tex plotter came with a new Navionics Gold card. When compared to my iPad and my Mark1 Eyeball, the Navionics was about 200 meters BEHIND where my actual position was.

They sent me a new C-map chip and its bang on. Even though I have Navionics on my iPad, it's on my sh*t-list right now.
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Old 08-21-2017, 03:40 PM   #12
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Quote:
Originally Posted by cardude01 View Post
Yeah I've just using my eyes and lining up the reds and greens.

Just an FYI, right before the Monterrey bridge near Stuart, heading West, there was a floating red can and next to it my depth finder showed 1.2 feet under the keel. That seemed shallow.

Maybe it drug.
Green = Can
Red = Nun

At low tide in windy conditions, ATONs can wander a bit.
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Old 08-21-2017, 04:51 PM   #13
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How come my auto GPS doesn't take me over water.
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Old 08-21-2017, 06:17 PM   #14
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The original chart that was used was off (datum from Charts not updated in one hundred years) and it filters to the electronic charts. I'm always amazed at how my radar will place the shoreline off from the radar overlay electronic chart. Never use just one source of information when navigating.
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Old 08-21-2017, 07:42 PM   #15
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How come my auto GPS doesn't take me over water.
Because they are programmed to take you over empty fields and cliffs.
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Old 08-24-2017, 07:25 AM   #16
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When you are traveling in a man made ditch the chart is "Mapped" where as most waterways are "Charted". What ever that means. So I have been told.
That being said, there are places where the magenta line and even the "White Depth Road" are wrong. Always remember that the nav markers you see in front of your boat take priority over that electronic thing at your helm.
Good example:
The following Blue Charts picture shows the ICW just south of the Savannah River. But if you look at your Navionics Gold chart, the White Road puts you on the wrong side of the two reds. Which is solid rock two feet under water!
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Happy Travels
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