How to record sonar logs with Raymarine

SonarCharts™ is an HD bathymetry map featuring extraordinary bottom contour detail, great for increasing awareness of shallow waters and for locating fishing areas at any depth level.For more accurate local SonarCharts™, record sonar logs with your Raymarine and send them to Navionics. Navionics integrates the continuous stream of sonar logs shared by individual users with existing data to ensure SonarCharts™ reflects the ever changing conditions of sea, lake and river bottoms.
All you have to do is enable sonar logging on your GPS chartplotter:
Units from 2003 to 2011
Log format: NMEA buffer.
• C120, C80, C70, click here for instructions.
• E120, E80, click here for instructions.
• C140W, C120W, C90W, E140W, E120W, E90W, click here for instructions.
Units from 2011
Models: a67, a77, c95, c97, c125, c127, e7, e7D, e95, e97, e125, e127, e165 with LightHouse II Release 10.
Log format: .sdf. click here for instructions.
Log format: .gpx. Soon compatible with others. Click here for instructions
Simply go to Downloads & Updates, plug your card into your PC and follow the procedure. It’s easy.
Updated SonarCharts™ will be available for download with Freshest Data after about one week.