If you own a Humminbird Down Imaging unit -  you can use the XI 9 20  for ice fishing.  In order for this to work properly, you will want to take the following steps:  

  1. The software version for your unit must be at version 6.250 or higher to operate with the ice ducer. The sonar will be 200 kHz only for operation with the ice ducer for traditional 2D sonar.   To locate the software version that is presently operating in the system, power the unit on. Press the Menu key once when you see the name of the unit on the title screen. Press the four way cursor down to System Status. Press the Right cursor to enable System Status. From this screen you will see the software version that is presently in the system.   
  2. In the settings Tab turn the User Mode to Advanced
  3. In the Sonar Tab change Digital Depth Source from Auto to 2D Element.
  4. On HELIX units, you will want to turn Ice Fishing Mode to ON.

Compatible models :  385ci DI, 386ci DI, 581i HD DI, 587ci HD DI, 597ci HD DI, 688ci HD DI, 788ci HD DI, 858c DI, 858c HD DI, 859ci HD DI, 958c DI, 958c HD DI, 959ci HD DI, 1158c DI, 1159ci HD DI, HELIX 5 DI, HELIX 5 DI G2, HELIX 5 CHIRP DI GPS G2, HELIX 7 DI, HELIX 7 CHIRP DI G2, HELIX 7 CHIRP DI GPS G2, HELIX 7 CHIRP DI GPS G2N, HELIX 9 DI GPS, HELIX 9 CHIRP DI GPS G2N, HELIX 10 DI GPS, HELIX 10 CHIRP 10 DI GPS G2N, HELIX 12 CHIRP DI GPS, HELIX 12 CHIRP DI GPS G2N   

The XI 9 19 will not  work with these products.