Received my 898c yesterday evening and it came with a CD loaded with the manual. I took it all to work (2nd shift) with the extra power cable and proceeded to go thru the demo and all the menu's of the unit. With the two short trips on the water with my 798c, I was able to understand the system and what I'm seeing much better. If I would have had the extra pwr cord, I bought with the 898c, I would have done the same with the smaller SI unit.
BTW... I bought my unit from BBG Marine Electronics after another "Cheaper" online merchant could not produce the in stock status of the unit. Can't say anything bad about BBG as I called to make sure they had it in stock. Fast and friendly service. Brian is on top of the current status of things, like the Interlink problems and such (backordered till HB knows when!)
. Good folks for sure.