A buddy just bought an older helix 7 and wants to use it for ice fishing. Hes wondering what transducer to buy for it. From the googling I've done it depends on the model of the helix. His says helix 7 sonar on the bottom. No chirp, gps, di, si or anything else.
Hes also wondering about updating the software, the unit has software versions 7.620
I've looked into that and it looks like you use a memory card for that but I cant find a place to insert on this helix