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I was cruising down the South shore of Grand Bahama the other day and noticed that an island named Peterson's Cay, which is about a mile East of the entrance to the Grand Bahama Waterway, was not showing on my Garmin 4208 chartplotters. This would be a dangerous situation if you were relying on your chartplotter at night to guide you.
I was cruising down the South shore of Grand Bahama the other day and noticed that an island named Peterson's Cay, which is about a mile East of the entrance to the Grand Bahama Waterway, was not showing on my Garmin 4208 chartplotters. This would be a dangerous situation if you were relying on your chartplotter at night to guide you.
You really should not rely on your plotter as your sole means of navigation. is the island on any raster paper chart?
__________________ "I love you and respect you very much. But I will kill you dead before this day ends"
CME asks a good question. The problem of errors in the electronics charts, especially errors of omission, has been discussed a bunch here before. Many (probably most) of the errors in the electronic versions are taken directly from errors in the official paper charts for the area,
I am running aground at least two or three times heading to Oregon inlet NC on my C-Map and Garmin charts!! Of course the track I am running is considered non navigational waters...... Mark
I am running aground at least two or three times heading to Oregon inlet NC on my C-Map and Garmin charts!! Of course the track I am running is considered non navigational waters...... Mark
Mark
Of course from all I've heard (only "heard"--never been there) doesn't the channel move there on a daily basis?
Let me get this straight, your cruising around in your YACHT, in February, in the beautiful sunshine, all while I'm getting wicked cabin fever in the middle of an all out blizzard, and you want use to feel bad for ya because some obscure hidden un-touched white sand beach with a couple mermaids I'm sure thrown in just for fun, isn't on your chartplotter????????
I also strongly hit some rocks 10 days ago and thought I would sink. I still do not know how I could get out of that impossible situation. I was guaranteed about betweeen 1.2 and 3 meters depth!
g2Vision!
And you know what? from the navigation chart to the fishing chart, at that place, the 2 meters depth line is spaced by about 30 meters!!!!
And about 2 miles from there is now one of the main port of all Vietnam. The map shows less than 5 meters, but I did read 60 meters deep. And they do not dredge that deep.
However, all that area is shown as shallow water, while dozens of vessels pass trough. Would they rely on wrong GPS maps? Most likely not. So there must be accurate maps of that area. Sometimes I wonder if it is not just a matter of the GPS map providers not want to pay the source of the updates.
I did not show up here as people would think that again we come to bash, but now I see I am not alone and add my 2 cents.
Oh Lord, forgive me, for I do watch my depth sounder while I should be able to rely on thy Holy Constellation of beeping objects so high in the firmament....
__________________ If it ain't broke, I haven't played with it.
Of course from all I've heard (only "heard"--never been there) doesn't the channel move there on a daily basis?
Yes Sir!!
In fact there should be a Island now on the charts in the lower right side of this photo!! The charters keep the barrels in the right postions most of the time. If it wasnt for them parts of the channel would fill in. If you ever visit Oregon inlet fishing center there is a jar inside for donations to help the captains so they can keep the channel marked.
The Garmin 4208 comes with the charts for the area already installed. Garmin should look into this as it is a popular cruising area and I think if a boater runs into it at night they won't be very happy with Garmin.
This has nothing to do with Garmin, Cmap, MAptech.... it has to do with 2 other parties:
1. Mother nature: If as above, the channel moves daily, what do you expect, the plotter to update itself daily via XM or something?? (although, come to think of it, that sounds like a great idea, XM chart updates... (added to my list of business ideas!)
2. Government $$, as in wether or not their is enough money left over after everythig else, to document and update the marine charts. Cause that is where the data comes from.
YOU ARE RESPONSIBLE to check local charts, local regs, and local notices to mariners when transiting.... NOT garmin, NOT the US government... Geeeesh.
Last year I ran aground cause I followed the chartplotter showing an "old" channel. Well, that channel doesn't exist any longer. That was MY fault, the local notices to mariners clearly marked the new channel... I didn't check it. Lesson learned.
yes I have paper chart and none of you would be able to use at that time at that place and that I make 3000% sure
Birdman, you problem is not a matter of accuracy, it is a matter of update.
I think that maps shall at least play iit conservative and never indicate information when they are not accurate. At least we then have to know we have to pay attention.
And still, how to explain the 100 feet distance from the 2 meters depth line between 2 g2vision maps?
yes I have paper chart and none of you would be able to use at that time at that place and that I make 3000% sure
Birdman, you problem is not a matter of accuracy, it is a matter of update.
I think that maps shall at least play iit conservative and never indicate information when they are not accurate. At least we then have to know we have to pay attention.
And still, how to explain the 100 feet distance from the 2 meters depth line between 2 g2vision maps?
Keep in mind that Garmin doesn't generate any of its own cartography. They rely on government organizations like the USGS in the US to provide chartss.
In the case of Vietnam, the last time the USGS generated publicly available charts of the Vietnam coast was probably before the end of the war. I would guess a number of features have changed since 1972. HAs Vietnam published any charts in recent years?
But the bahamas should be a different matter. If maptech has accurate charts, then Garmin should have them as well and be using them. They use the same data sets.
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Terry Jason 35, Yanmar 370 hp, Lots of fun at a leisurely pace
HI Greg, there are gvt's maps or commercial maps. In paper I do have the admiralty chart, and the g2 (and Navionics) seems to be direct inspiration from that one. PAper chart indicates rocky area which does not show on the g2.
New main port receives 1,000 feet vessels for more than 3 years, and the channel exists more than 5 years. There must be maps or would they risk to go blind?
We expect much more accuracy from GPS than a paper chart.
I wonder who really would be able to use a paper chart and get 100 foot accuracy
dont feel bad,everytime i go to the lake,my Lowrance says i'm fishing on land in some of the smaller creeks?
its hard not to,but do not rely on your chartplotter 100%.
we have become too dependent on electronics,hell if we have a power outage,most people can not even get any money????
Most GPS's have a position error averaging around 12'. So, if you are fishing on the banks sometimes it will show you on land. The position error is another reason not to rely solely on a chartplotter.
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Missing Island 
