Sonar logs in multiple formats

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I had heard you can record sonar logs and submit to be added to maps. I had tried submitting previously but there was a problem with the format. Just found out that Navionics now accepts multiple formats of sonar logs as contributions to SonarCharts™. This includes Humminbird (DAT and GPX on all models, ION and Onix compatible within summer), Lowrance (GPX), Raymarine (SDF, GPX, NMEA),Simrad (GPX), and Garmin (ADM).

Anyone had any experience with this?
 
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