The way I understood it was if you use the pdrt-wsbl that is in the bilge.the unit will automatically default to that tranducer for sonar and water temperature reading. Even though the totalscan tranducer has this ability. The total scan is suppose to be a “one tranducer does it all”. But if used in conjunction with other tranducer it will loose some of it capabilities..this was the way I understood it explain to me. And maybe I misunderstood it. Talk the Bryan at bb&g . He definitely can explain it better.but please keep us posted.Also the totalscan big advantage over the lss-2 is the totalscan has the 360 view ability if the 3d processor is used..I was wanting to upgrade one unit myself and I was basically just wanting to use all my existing pdrt-wsbl and lss-2 tranducer. Basically unhook my hds gen 2 and hook a new generation 3 in its place. I was told this can be done. But after being told of a few loses Im second guessing and may hold out and just look at for a good used gen 2 10Last edited by Redngoo on December 25th, 2016, 2:53 pm, edited 1 time in total.2013 PANTERA 2MERCURY 200 PRO XSMINNKOTA 80LB FORTREX25 fury