i just purchased a new boat that came with a 93SV with a through hull transducer installed at the console. When I go to the home screen the unit only shows 2D Sonar and map choices. Is that all this unit will do or will it do SV and/or CV with different transducers installed. I intend on removing this unit and replacing it with my Helix 12. I may end up pairing it up front with my 1242. I have looked on the Garmin site but could not find the answer that I am looking for.