To know exactly witch transducer you are running, just check at the end of the transducer cable where it connect to youre unit, there is aluminium fold paper with a number. Let me know the #. The Hook run probably a HDI transducer and there is a way to get them compatible by choosing the transducer in the installation menu.
As for the power cable they are compatible. The Hook is probably red and the HDS is blue but they can be use on either.
As for the Navionics you can't use a laptop to read a Navionics map. If you got a smartphone or a tablet you can; you need to purchase the app for the phone ($15) or for a tablet HD version for I think $40-50).