Owned it and install them. Ask away....
The built in GPS antenna in the C90W is outstanding.
I would get the Plat+ chip for the software.
The DSM30 is a 600w xducer controller. So, if your just doing a transome mount, you'll be fine. If you go thru-hull or In-hull, I would go with a DSM300 and do a 1000w system.
Radar's are phenominal. There are two Radar's. Digital and HD Digital. Digital is awesome--no noise on screen. HD Digital is off-the-hook! True color and Bird mode.. Software update due in a few weeks will allow a "Bird Mode". These Radar's rival commercial units in features and clarity.
The new Wide sereis will also allow you to add another CWide. The units will share the SINGLE Navionics Planum+ chip, interchange waypoints seamlessly and compltely share data ONE ONE CABLE!
pm me if you have specific questions. My boat has been outfitted with all the Latest Raymarine gear. If you want a look-see let me know.
Some of the install is rough...the boat is still not quite perfect yet.
Very nice systems.
Did you know there is a $1000 rebate on the C140W?