Yes with Ethernet.
Each unit would need an Ethernet adapter AS EC QDE.
Then an Ethernet cable long enough to go between them.
SI, blended DI, dedicated DI, 2D sonar, GPS data, Ethernet accessories can be cross-shared with a Sonar model, DI model, and a SI model.
Since neither of the units you listed are DI, there will be no dedicated DI possible since there is no source. DI would be a blend of the two SI pulses.
You can use the 360 to provide SI and DI to either unit also.
Edited by Wayne P. (04/12/16 02:37 PM)
Humminbird Helix 12 SI, 1198c SI, 1198c SI, ONIX 10 SI NT, 360, RC-1