Andrew. I have a similar setup to Tiger.
Garmin 18 XHD digital radar
Garmin Map 820i
Garmin 300 AIS VHF
Garmin GHS? 10 Wired VHF Handset at Helm
Garmin blue vision HD charts Northern Europe
Garmin GMI 20 wind x 2 port and starboard
Garmin GPH autopilot system with fluxgate compass
All the items are networked and I use Garmin Helm app to control the 820i plotter with my I pad.
This gives full function control of the Plotter, Radar, depth, AIS, waypoints and routes and all the other functions on the screen of the plotter including AIS target tracking and radar guard functions, anywhere on the boat. The app is free from Garmin and can be loaded to apple or android tablets and phones. The Blue vision charts give 3D terrain and charts as well as seabed/depth contours. The 300 AIS VHF is fully integrated giving all the normal AIS functions and alerts on screen on both plotter and Ipad. I particularly like the steer to wind function on the auto pilot, and the self tack. The safe route function takes the parameters of your boat and the charts, tides, and plots a routejust like a sat nav. I have not used it on a long trip but it seems to work well. However, I did find that the original software had a few bugs, but it seems to be sorted with the updates that are also free from Garmin. I like the fact you can set up a number of custom pages, split screens, data, and waypoint info and easily switch to these custom pages on the plotter or Ipad. Again any functions of the plotter can be displayed on both and controlled. Having said that, my neighbour has a B&G system and it appears to have many of the same functions at the helm with a big 15inch or so plotter at the nav seat. So it may be worth looking at the B&G too.
Hope this info helps.
Oh one other thing :-) you can use the Ipad to record video or stills of the screen for those "I don't believe you" moments.
Ant.