[Googull]

No question that NMEA is the ideal and that there are indeed many cool devices to bridge NMEA to TCP and more devices made with integrated Ethernet like Furuno's FA50.  I totally agree that what needs to be added is for MacENC (and iNavX) to send the active route over WiFi (TCP/IP). Actually the other NAV systems (Coastal Explorer, Nobeltec, NavNet) need to do likewise.  Perhaps they will in the future, peraps as you say, they will use other solutions. In the meantime, there is a large installed base of these systems that support importing nav data from files in the Open Navigation Format (ONF).  I expect you could broaden the appeal of iNavX if you supported this lowest common demoniator for transferring route data as well.  Not to suggest that iNavX doesn't have other great features but the big iPad appeal is route planning and without the ability to export routes to existing systems locally it is no different from the other lesser expensive iPad applications on that front.