The HELIX 9 comes with everything needed to get 2d/DI/SI/GPS chartplotting ...

The 360 is an additional Ethernet accessory (AS GPS HS antenna and Ethernet cable included) that adds the 360 imaging to the above features in the HELIX 9 ...

The HELIX 9 would also need the AS EC QDE adapter cable to connect to the Ethernet cable ...
Humminbird | AS EC QDE

Rickie