Structure Scan transducer has two SIDE SCAN crystals and one DOWN SCAN crystal.
No, only the Humminbird ONIX SI transducer has two SIDE IMAGING, One DOWN IMAGING, and 2D crystals.
The core unit SI transducer does not have a DOWN IMAGING crystal. DI is a blend of the two SI crystals.
Humminbird Helix 12 SI, 1198c SI, 1198c SI, ONIX 10 SI NT, 360, RC-1