Try the ReefMaster Sonar Viewer FREE for 14 Days

  • Sonar Viewer is a Windows Desktop application (see minimum system requirements, below).
  • If you want to keep using the Sonar Viewer after the trial period expires, simply buy a license. No further download is required.
  • The Sonar Viewer can be easily and completely uninstalled after the trial period, if required.

 Download Sonar Viewer

Download and Installation

  • Please review the End User Licence Agreement before downloading.
  • Download the setup files by clicking the download button, above.
  • Once the download completes, run the downloaded installation file and follow the on-screen prompts.
  • Further files may need to be downloaded from Microsoft in order to complete the installation.

Minimum System Requirements

Microsoft Windows PC with:

  • 1GB RAM.
  • 250MB free disk space.
  • Microsoft Windows 7/8/8.1
  • Hardware support for DirectX 10.1
  • An internet connection is required for the display of background maps.


The ReefMaster Sonar Viewer works with sonar log files from Lowrance and Humminbird devices.


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