Since 30 September 2018 (*), I already had information regarding the abandonment NAVX Studio LLC for the development of two historical applications created by Richard Ray : GPSNavX and MacENC. The buyers of these applications and iNavX had clearly announced focuse only to the development of iNavX, on iOS and Android. It is likely that applications on Mac no longer had any profitability, especially with the loss of Navionics charts for MacENC.
The announcement is now official, GPSNavX is permanently removed from the AppStore and MacENC will be removed from sale on iNavX website :
“Just a heads up on the future of MacENC. [The app] MacENC will not receive any future updates and it will be taken off the market sometime this week. As long as you do not update your Macintosh computer to Mojave, it should continue to function pretty well. However, it is very limited on computers using Mac OS X Mojave.
That is. It now remains for Mac only OpenCPN, which is far from the ergonomics and professional quality had yet MacENC. It's really sad !
(*) Navionics charts are no longer available for MacENC [Update]