https://www.youtube.com/watch?v=foTI...e_gdata_player i hope that you don't delete this link to this video.its showing that i use only one transducer for si/di2d and high speed.all in one transducer setup.this will be the last post for me.there really is useful information in this thread. It is getting a little off track but not to bad. I believe that this thread gives a better overall description of the capabilities and restrictions of these units that I've seen.the touch owners still need to show pictures of there units operating in very shallow water and deeper water.(in line with what the specs for there unit is)also pictures of the max range. If they would have just done this from the beginning this would have prevented those off topic and useless posts