Yessir ... The 50/83/200kHz simply means the unit is capable of transmitting those three 2d frequencies ... dependent on which xducer is connected and selected (83/200kHz xducer or 50/200kHz xducer) ...
With the HELIX 2d GPS G3N connected to US2 - You would select "HB 83/200kHz" in the "Connected Transducer" selection under the Sonar tab ...
Rickie