Thanks: 0
HaHa: 0
What sonar do you have? And which Navionics chip?
Go to the WebApp and you can preview the Mapping, when you zoom in on the area you want click on the SOnar Icon on the lower left corner this will give the SonarCharts view available on Nav+, Nav Updates and Hotmaps Platinum. If you have a Humminbird Sonar you can log sonar and upload to Navionics and they will create a map that can be downloaded thru Freshest Data
Web App http://www.navionics.com/en/webapp