Originally Posted by Erin
Won't accept GPS aerial data via N2K
Doesn't network, though will accept radar via ethernet port
Doesn't have video in
It does network, though not as we now know sonar (or radar) but one unit will
display non-networked feeds for either or both.
As said it comes down to value for money really, £1800 for the 8" screen fully networked 5 series versus £900 for the 7" screen 750S.
You also need a black box sounder to get proper sonar into the 4 or 5 series, so if you want a good value sonar-capable plotter then you are going to have to look a long time for something to beat the 750S.
Unless of course you want to do as Bruce rightly points out and consider a Lowrance, which is similar money and blows Garmin out of the water (for now) with sonar performance.
Zippy's solution of two 750s networked together is a good one, and at the same price as a single 5008 your getting 14 inches of versatile* fun.
* Not the first word I typed!
Unless you really need a networked GPS or SONAR or RADAR, or you really need video inputs then I would go with the 750S. Then spend the change on fuel and use the boat more.