I'll be able to use an i-PAD or Smartphone OS with the 741xs. The 740s will be the back up and a 2nd display mainly for monitoring the AIS. There's nothing complicated about the system installed in my Mainship or the more basic system going into the Gulfstar. It's called redundancy something you will never have using one MFD or chartplotter. I don't trust Smartphone or IOS apps for boating. Using a Smartphone or iPAD as a stand alone platform might be okay for a dingy. This is just my personal opinion.
Bill
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