One of the benefits of a Windowing environment is that you can run the chartplotter program twice, with different areas showing, or the same area at different zoom levels. No turnkey chartplotter, or even an iPad or Android, can do this
Raymarine Lighthouse does it on my e7d. You can run two "apps" side by side, or the same "app" twice, or run any of them full screen.
Here is an example (from the helpful panbo blog) showing ENC and RNC charts next to each other, but you don't have to mix and match:
With the larger than 7" plotters you can run up to 4 apps. This is also from panbo, showing 3 apps:
I normally run my plotter with charts on the left and data on the right, but sometimes do full screen charts or charts on the left and sonar on the right.
Raymarine also (finally) uses GPX files for waypoints, tracks, and routes, so you can use your favorite planning software at home. Previously you had to convert to their proprietary format.
I have yet to see an iPad (or PC) based solution that works as well in the sunlight, is waterproof when plugged in, and with NMEA 2000 integration for less money than a nice plotter. My plotter gets a lot brighter than the iPad Air, Nexus 7 (either version) or Dell Venue 8 Pro, all of which I have. NMEA 0183 has lower data rates than NMEA 2000 which is annoying in more complex networks, especially if you want to capture speed changes during wind shifts. I like having two displays in the cockpit, a data display near the companionway that can be seen from anywhere and which shows wind and speed, and a plotter by the helm for navigation.