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Garmin Fishing Charts not accurate

Old 07-02-2011, 08:04 AM
  #21  
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In the Sea of Cortez the Garmin chart data is completely useless. The land masses (islands) are up to a mile off actual location, and lighthouses, as well. As to bajos, seamounts, etc. - forget it. Boaters must get accustomed to often cruising over dry land and finding bottom structure on their own and marking coordinates on GPS.
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Old 07-02-2011, 12:04 PM
  #22  
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I live in the Fl Keys and the charts are dead on here, but I want over to Bimini for the full moon mutton bite and was on the NE side of Great Issacs and where we were supposed to be in 90 -120 ft we were still is 1700 to 1850 ft of water, to my best guess the charts were off almost 1\4 mile, I also have a e-120 and it was't much better as far as accuracy.....Dean
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Old 07-03-2011, 09:36 AM
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I've had similar issues with the fishing charts in the Bahamas. Some places they are spot on and others not even close. Buts its to be expected.
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Old 07-03-2011, 07:04 PM
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I do agree with the lack of accuracy with the Garmin Vision. I have found that certain areas of both Vancouver Island and Puget Sound charts leave a lot to be desired. I had a local guy on Vancouver Island tell me that my charts were horrible. I looked at his charts on his Furuno system and I was a bit surprised at the lack of detail on my charts in comparison.
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Old 07-10-2011, 09:09 AM
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You're all blaming the wrong thing. GPS puts you within feet of a real, true, actual position. Charts don't. GPS makers don't (usually) make charts, they use the best charts available, but:
Those charts can be very old and very wrong. They may or may not work for someone who is navigating from visual fixes from another part of the same bad chart, but they could have been made a hundred years ago by barely literate adventurers on small boats with Moctezuma's revenge and a very bad hangover. They may have gotten one little number wrong, and nobody has bothered to correct it since.

The areas of the world where charts are corrected are limited to commercial routes, not shallow water on the way to dusty little fish camps.

New technologies like satellite imagery can be used to redraw charts everywhere, but the money won't be spent for any place less travelled. Many times in remote areas you can get better information from Google Earth than you can from charts.
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Old 07-10-2011, 01:38 PM
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Originally Posted by MOCEAN CONTROL View Post
here is what i found off bimini !
I also have an issue with the Fishing Chart up here at Stellwagen Bank.

Mine has the same problem as Mocean Controls post with double grayed out contours from some other area that I can't even recognize.
Mind you that this only appears on the G2 Vision - Fishing Chart not on any other chart option available from the Chart Menu.

LarryGaddis and Mocean,
Are you running two or more Garmin displays on the network with more than one Vision chips installed in their slots?
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Old 07-11-2011, 11:36 AM
  #27  
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Originally Posted by sandyda View Post
First post danro? Thought you'ld make a big splash talking about Faked this and hand drawn that? or are you just some guy who has lost all cred here and is trying a different login to get another stab or two in?
LOL!!! There seems to be ALLOT of that going on around ere sandyda.


Originally Posted by dolphan View Post
I spent some time with Homeport and thought I had found a pinnacle off Stuart, Fl. It is labeled Walt's hill on the picture. It does not appear until you reach a certain zoom level on the charts. I headed out there my tail was waggin'. Only problem was it did not exist. My Navionics chart showed the bottom as it was. Slightly declining as you head East. Not looking to slam Garmin or pick a fight with anyone. Just a mistake I found. Dampened my spirits on searching for new bottom details with the Garmin charts.
dolphan,
I'd bet ya that "hill" is there!! I can't believe it's a "named" hill, but isn't out there??? My GUESS would be, some fisherman found it years ago in the 70's or 80's with his LORAN, then published/passed down the #'s over the years, and possibly even passed around the wrong #'s of it (to save his "secret" spot) that were off by a couple of miles.... THEN, years later somebody simply converted the LORAN #'s to a GPS position using software which is not always very accurate (aka can be miles off!!). Somewhere along the lines, it was picked up by NOAA or some fishing chart maker..... And what we are left with is a named marked "hill" on the charts nowhere near where it really is. Again, just a total random GUESS, but I'd bet I'm closer to being right than you might think.

As an example, I have a BUNCH of lat/long positions of WRECKS off LI/NJ that I received many years ago when LORAN was still popular. Not sure who or how most of them were converted or where the original #'s came from in the first place. But I have since either been to these locations, or received more updated #'s or "corrected #'s of these wrecks, and have found some of them off by as much as 10 miles. I'd venture to guess the same issues are involved with many of them. People protecting/hiding the actual site, error converting, chart errors... add them all up.


Originally Posted by MOCEAN CONTROL View Post
here is what i found off bimini !
Those are some BIG differences!! Are these remote area's?



Originally Posted by jethro1 View Post
As a former resident of Hawaii, I can say "yes they do".

The problem, and only problem, with Hawaii is the Hawaiians. They act like they have some god given special right to the place. If I recall my history correctly, they moved to the Hawaiian islands from somewhere else, just like everyone else. Because they got there ahead of some others, they have a sense of "entitlement".

What does this have to do with charts? My comment may be construed as "off the charts".
LOL!!! I hear ya! I can tell you some Surf territorial stories that sound similar. But still, if your in Hawaii, you really should not have the right to complain.


Originally Posted by Bill Erhardt View Post
In the Sea of Cortez the Garmin chart data is completely useless. The land masses (islands) are up to a mile off actual location, and lighthouses, as well. As to bajos, seamounts, etc. - forget it. Boaters must get accustomed to often cruising over dry land and finding bottom structure on their own and marking coordinates on GPS.

Been watching "Shark Men" at all? Pretty cool stuff in the Sea of Cortez....


Originally Posted by sandyda View Post
You're all blaming the wrong thing. GPS puts you within feet of a real, true, actual position. Charts don't. GPS makers don't (usually) make charts, they use the best charts available, but:
Those charts can be very old and very wrong. They may or may not work for someone who is navigating from visual fixes from another part of the same bad chart, but they could have been made a hundred years ago by barely literate adventurers on small boats with Moctezuma's revenge and a very bad hangover. They may have gotten one little number wrong, and nobody has bothered to correct it since.

The areas of the world where charts are corrected are limited to commercial routes, not shallow water on the way to dusty little fish camps.

New technologies like satellite imagery can be used to redraw charts everywhere, but the money won't be spent for any place less travelled. Many times in remote areas you can get better information from Google Earth than you can from charts.

Ah-men!!

I see close to perfect soundings on my G2 Vision chart, but I'm off Long Island in the very popular and well traveled (commercial fishing AND commercial shipping) areas. I've actually been amazed at how accurate they are, out in the canyons my sounder says 1254' and the G2 Vision has a contour that says 1250... Come to think about it, I don't ever recall finding an error anywhere I've been around LI on my G2.

BUT, I really wish they (chart makers, NOAA, and the manufacturers...) would figure out a way to make the charts more accurate when converted to digital for us. ALL of them (Garmin, Raymarine, Navionics, CMAP...) are OFF a bit (50' or so) when it comes to the back bays, rivers, inlets, canals... mainly from the round earth to flat chart conversion error I think. I hate motoring on the sand to get into my canal each time.
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Old 07-11-2011, 11:45 AM
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Originally Posted by Birdman View Post




dolphan,
I'd bet ya that "hill" is there!! I can't believe it's a "named" hill, but isn't out there???
My name is Walt and I named the hill while in Homeport when I made the big discovery. I was fixing to be famous. You still wanting to bet?
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Old 07-11-2011, 12:10 PM
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LOL!! Didn't notice the fish icon, first glance I thought that was named on the chart text.
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Old 07-11-2011, 12:13 PM
  #30  
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My only real gripe with the fishing charts is that they don't show the contour lines I'm used to identifying structure with unless you are zoomed in just right. Too close and you see too much, too far out and you see nothing.

It won't show the outlines of the dump for example until you are zoomed way in. I had to create a square route to be able to see it.

If they are going to publish a "fishing" chart view, at least put labels on it you can see at any zoom level (or at least make that a menu choice).

Not a huge hassle. Everything seems to be where it should be, it's just a matter of making it appear on the chart so you can reference it.
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Old 07-11-2011, 12:27 PM
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Originally Posted by hwbjr View Post
I do agree with the lack of accuracy with the Garmin Vision. I have found that certain areas of both Vancouver Island and Puget Sound charts leave a lot to be desired. I had a local guy on Vancouver Island tell me that my charts were horrible. I looked at his charts on his Furuno system and I was a bit surprised at the lack of detail on my charts in comparison.
HWBJR, Have you noticed that the Rats Nose off Bamfield at 25 mile Bank does not show up on Garmin but shows on Navionics, Furuno Charts and NOAA? I have sent Garmin a snap shot of the Navionics as well as the Garmin to compare.
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Old 07-11-2011, 01:25 PM
  #32  
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Originally Posted by Birdman View Post
LOL!! Didn't notice the fish icon, first glance I thought that was named on the chart text.
Darn and I really had my eye on Machria!
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