The sidescan mosaic module has been released along with ReefMaster v1.8. This module is compatible with both our PRO and LITE editions, so those you want only sonar viewer, waypoint manager and mosaic features do not need to buy the full mapping edition.
The sidescan module works with either Humminbird or Lowrance data (or a combination of the two), and can create very large mosaics (over a mile across) and still export images at full resolution. Export formats include KML super-overlays for Google Earth and the MBTiles format, supported by ReefMaster and other GIS applications (including QGIS).
This short video presentation demonstrates the new sidescan mosaic module:
https://vimeo.com/110451960