After visiting a salesman at Bass Pro this weekend here is what I found out:
Yes the 788 hd SI does not exist in real life, It does exist in Bass Pro's NEW catalog!! It is a misprint, the salesman said there were numerous problems with the new catalog this year.
Also the 768 is as stated, is an older version and is being brought out by Bass Pro for their Spring Fishing event, it is in the sales flier as a limited supply going on sale this Friday. It is able to hook up to other units but only with the interlink system as it has no Ethernet.
Sorry for the misunderstandings but I guess I have studied the Bass Pro catalogs more than the proof readers. Maybe I can get a discount from them for doing there jobs??????