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Author Topic:   Navionics Announces New Chart Data
jimh posted 07-03-2013 10:38 AM ET (US)   Profile for jimh   Send Email to jimh  
Navionics have announced the publication of new electronic charts in a format they are calling Navionics +. For details see

The charts are said to combine three elements of data:

--navigation data such as location of aids to navigation and spot sounding data

--bathymetric depth data with detailed contour lines, referred to by Navionics as SonarChart; and.

--crowd-sourced data about shore resources such as marinas, restaurants, accommodations, and so on, referred to by Navionics at Community Edits.

For more information see

jcush87 posted 07-04-2013 03:24 PM ET (US)     Profile for jcush87  Send Email to jcush87     
Sounds pretty cool. It looks like you get 50% off if you bought a navionics card after july 2010.

It seems like they are trying to do something similar to insight genesis with the crowd sourced data. Has anyone tried this?

jimh posted 07-24-2013 11:19 AM ET (US)     Profile for jimh  Send Email to jimh     
I visited the Navionics website recently. There you can preview the new Navionics+ charts. I used the preview viewer to look at chart data for the area we were boating, near Northport in Grand Traverse Bay, Northern Lake Michigan.

I was very impressed with the Navionic+ chart for that area. There was a presentation of depth soundings with contour lines at one-foot intervals. This presentation of the hydrology of the area was the best I have ever seen.

Next, I scrolled the preview viewer into Georgian Bay, in order to see what the Navionics+ charts looked like for the Canadian Small Craft Route. Here I found a surprise. The preview viewer cannot show this data because the publisher, the Canadian Hydrographic Service, prohibits that use.

The preview viewer is a bit hard to find on the website. Here is a link to it:

Readers may find previewing the new Navionic+ charts with their web viewer will be an good way to see what sort of detail is available for your particular area in these new charts.

jimh posted 07-31-2013 08:21 AM ET (US)     Profile for jimh  Send Email to jimh     
I visited the Navionics website to use their Navionics+ chart preview, this time looking at some remote areas of Lake Superior. Again I found the depth soundings presented in contour lines of one-foot interval. This was amazing detail for the depth soundings.
Chuck Tribolet posted 07-31-2013 08:53 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
I went to Navionics' website and had a look at an area that
I'm very familiar with because I've done several hundred dives
there, because I've whalered over it a couple of hundred times
with my Humminbird six-beam SONAR, and because I've done
detailed bathymetry of it using GlobalMapper software and
the wonderful GIS data available from the Seafloor Mapping
Lab at Cal State Monterey Bay (guess where they practice).

First, you need to click on the sonar icon in the lower left
to get the high res contour lines. But those contour lines
are highly interpolated and don't show anything near the reality
of the ruggedness of the underwater terrain.

And they have the NE corner of Pt. Lobos State Natural
Reserve located way too close to shore. Navionics locates it
about 400' off Granite Pt, when in fact it's 1150 feet
offshore. This is clearly wrong when you notice that the
north boundary of the Reserve trends north as you move west,
when in fact it trends south as you move west.

To their credit, they do include the new State Marine
Protected Areas there, and accurately, at least by eyeball.
But they use the wrong symbology. They use a thin solid red
line, when it should be a bolder red line with very short
lines pointing into the reserve.


jimh posted 07-31-2013 09:11 PM ET (US)     Profile for jimh  Send Email to jimh     
The presentation with one-foot contour lines is nice. Now, whether or not the data is accurate, well, that's another topic.
Chuck Tribolet posted 08-01-2013 08:23 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
You want presentation, try this: 30870560_6vQzXH#!i=2669912561&k=KMGmHzD&lb=1&s=O


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