Thanks Tom.
However, although the Android File Transfer worked for routes it was clunky to say the least and now every time it opens it says it has to close, which is as much use as a chocolate teapot.
It is way easier, for me, to use MyRoute App and just port routes over using Garmin Drive from my phone or my iPad. Simples!
The problem is that the only way to get POI's, like speed cameras, into a Garmin is via POI Loader as far as I know. And POI Loader now does NOT give the option of putting the database files on the Garmin, only onto the computer which is where they are to start with, so again, chocolate teapot. I 'miht' make it work via Android FT if it would stay open long enough to be of any use to me.
Nothing on God's little green earth will ever get me to use BaseCrap. I used to use MapSource which was clunky and long-winded but at least it was stable and understandable.
The world has moved on and MyRoute App is the way forward for me with a big-screen iPhone as a navigator using the upcoming MRA Navigator Next.
In the meantime, I just need Garmin to admit they were wrong and make the thing talk to a Mac with something that they DO support and which gives useful error messages rather than just saying it needs to close.