I haven't tried the new nobletec app but from the screen shot I see one flaw. That compass rise takes way too much precious real estate space on the screen...
Since my previous post on this thread, many more apps have come on line and a few months back after my laptop failed i went to a 128gig ipad with built in GPS ( again, all cell data iPads have the built in GPS evening you don't activate the data service, the wifi only versions do not and require an external receiver). The built in GPS is as accurate as any other external or marine GPS.
I also use a lifeproof case which is waterproof to 6' so no worries if i take it in the tender
So far the app I like the most is the recently released garmin app. Works well, includes active captain data, easy to read, etc. the Bahamas chars are fantastic which is important for us.
Ipad is readable outside, much better than a laptop or iPhone.