The 360 is basically Side Imaging that rotates. It has two Side Imaging crystals just like a Side Imaging transducer has.
The spec depth range is 150'.
It can use used for Side Imaging and Down Imaging, the 360 stops rotating and orients the two SI crystals left and right to do that.
It is compatible with Ethernet capable 2D, DI, and SI models of the XX9, and Helix units and the SI Ethernet compatible models in the XX8 series of 800, 900, and 1100 units.
The 360 is an Ethernet accessory and needs at least a 2D sonar source for depth.
It is connected either directly to a display or to a 5-port Ethernet switch to be shared.
Humminbird Helix 12 SI, 1198c SI, 1198c SI, ONIX 10 SI NT, 360, RC-1