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Old 07-02-2023, 07:01   #1
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Exporting Navionics Sonar Data

Has anyone figured out how to extract the data from a Navionics App sonar log?

I suspect they lock this data down inside their own ecosystem, but I bet somebody has a way of getting it out!

The live updating sonar data is one of the (few) things I actually like about the Navionics app, and I would very much like to extract Lat, Lon, Depth data from it.
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Old 07-02-2023, 08:20   #2
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Re: Exporting Navionics Sonar Data

Garmin uses their Quickdraw Countours to allow the exchange of depth data. The amount of data and the great definition is amazing. A lot of people have been submitting data for a few years and the result is becoming extremely useful.
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Old 07-02-2023, 08:53   #3
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Re: Exporting Navionics Sonar Data

Quote:
Originally Posted by AnsleyS View Post
Garmin uses their Quickdraw Countours to allow the exchange of depth data. The amount of data and the great definition is amazing. A lot of people have been submitting data for a few years and the result is becoming extremely useful.
A caution: in some places (certainly here in British Columbia), Navionics "Sonar" data are simply interpolations of existing depth contours. These are not based on user data and are more-often-than-not highly erroneous.
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Old 07-02-2023, 14:35   #4
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Re: Exporting Navionics Sonar Data

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Originally Posted by sv_pelagia View Post
A caution: in some places (certainly here in British Columbia), Navionics "Sonar" data are simply interpolations of existing depth contours. These are not based on user data and are more-often-than-not highly erroneous.


Same here in Ireland, be very careful with Sonar Charts, they are sometimes very wrong.
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Old 07-02-2023, 17:36   #5
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Re: Exporting Navionics Sonar Data

You’ve all completely missed the point.

I’d never use the published sonar charts for navigation, they are positively dangerous.

When I am using the Navionics tablet app, it saves the depth data that is collected to draw contour lines locally. I don’t care about the contour lines, I have other, better, ways of generating them. What I want is to extract the data from the local files where it is stored… so I can use it in other places.

I COULD save all the data in the nmea stream, and then filter the depth out but I know the Navionics app has already done this…
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