Well Roddy, here are a few points to consider:
1) The price of a 360 is pretty high, and there may not be that many
people willing to pay it, so there may be a very small market for it.
Humminbird may not have even started building the units yet.
2) There may be bugs in the system that Humminbird hasn't worked
out yet.
3) Humminbird is going to have to provide a software update that will
integrate the 360 into the rest of the system. This software has to
be written and tested.
You may have a very long wait, indeed.