Exporting Navionics Sonar Data

[SailingHarmonie]

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.

[AnsleyS]

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.

[sv_pelagia]

Originally Posted by AnsleyS

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.

[AedanC]

Originally Posted by sv_pelagia

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.

[SailingHarmonie]

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…