I run a 997 (love it) & to keep track of my track & some GPS spots I also run my old Lowrance 330 but of course if I were to plug in the transducer I get interference, so My Question to U is-- been told U can run two Humminbirg without such interference so what model bird unit would U suggest with two card slots,20 & 60 degree beams, GPS, is avail that I can run along side the 997, thus I can use it for tracking solely & sharing GPS spots so no changing screens all the time and maybe use as a Hi speed over 20mph depth finder. thanks sorry its so long.............. is there any rebuilts avail