Free on Platinum+ (starts at $199); apps start at $4.99;
Navionics’s SonarCharts use sonar logs from users, along with data from the hydrographic office and proprietary surveys to add detail to a layer of cartography. Building on the company’s Community Layer of user-generated content, in which users can edit and update cartography on a data layer, SonarCharts allow soundings collected from user boats to upload data to a server, where it is added to the SonarCharts layer within 24 hours.
SonarCharts are part of Navionics Freshest Data program, which provides downloadable updates to cartography with the help of airborne laser and sonar surveys, satellite imagery, Local Notices to Mariners, and user-generated content (viewable on select plotters and mobile devices).
All Navionics users with a GPS chartplotter and sounder can contribute content to SonarCharts by uploading their sonar logs through the Navionics WebStore.
Boaters can look at SonarCharts’s added depth contours on compatible GPS chartplotters, web apps, and iPhone and iPad apps.
This article originally appeared in the January 2013 issue of Power & Motoryacht magazine.