ExploreOz Traveller - MacBook Air

In answer to your first question - no, there is not a version of the app that is compatible with your MacBook. The only Apple devices that run Traveller are iPhone and iPad. HOWEVER you can plan routes etc in the free on-line version of Traveller that runs through your browser (Chrome, Edge and Opera only). You can do everything except navigate - the on-line version does not support GPS. To access it you must be a Traveller user and have a Member account.

Re your second question, if you're looking for an app to run OziExplorer maps on Apple devices I can't help you with that definitively. You may find some help here, on Whirlpool.

If you find a solution to Q#2 in the Whirlpool link, then the obvious thing to do would be buy an iPad (I like to spend other people's money LOL). That way you keep all your devices in the Apple stable and get to run Traveller AND maps in Ozi format. Or, if you're happy with a small screen, use your iPhone. (I presume you're an iPhone user.)

If Whirlpool and other sources don't give you the answer you need to Q#2, then I think the only option would be an Android device just for navigation. It need not be expensive. That will allow you to run the Android version of Traveller plus the native OziExplorer app. Obvious disadvantage is compatibility issues with your Apple devices but if you confine its use to navigation then that may not be such a problem.

One option would be to use a Windows emulator (such as VMWare Fusion) on your Mac and continue to run OziExplorer. I've been doing this successfully on my MacBook Air for years.

Regards
Peter