I hope this is not a rumor and that it makes itself available very soon. (towfish) For depths over 30 feet the top scan side image is not reliable enough for SAR unless you are looking for large objects. We are having to use MST side scan more and more for these deeper depths. This is a cost compared to the HB product of which needs to have a towfish to make the job easier at an affordable cost.
We have seen what a towfish can do for those who have made them and Hb needs to make this step if it wants to penetrate the SAR community....
I really do not like having to have a facebook profile to be a part of the offering.. It would be nice to have this on another platform..
Chuck