On further investigation it seems that the csv format for the exported file comes out with a slightly different format than that expected  i.e. It has
mark,,lat,long  (note the double commas)
rather than
mark,lat,long

When I 'clean' up the csv file and remove that extra 'column' created by the two commas following the mark, I can then 'Import' it's OK

The 'Expedition Help' file shows the same format for both Import and Export

Could this be a glitch?

Nick,
Just updated, I was only one release 'old'.
Still no joy.
Interestingly, when I look at a 'route' and click Details;
the header row shows very light gridlines and you can see an extra column (blank)between "Mark" and "Latitude"

going further...

It appears to be creating a cloumn for the 'course' detail in the 'Mark Properties' i.e. "leave mark to port/starboard/sail to"  if checked the P or S does show up in the second column of the exported csv file.

This only happens when I click Details under Mark management I get the marks of the active route.

If I use on the tool bar Export/CSV I get a perfectly formated file but it is NOT the 'active' route.

Most mysterious

Nick,
Not sure what you mean by 'ribbon' panel?
If from the Marks tab I select 'Export' then 'csv'...
rolling over csv the description balloon shows "Export marks to csv file" which it does but apparently ALL marks not just the 'active' route.

Ernie

Nick,
I tried both 'Mark Mgmt' and the ribbon as outlined above.

Maybe this should be in 'Exp Improvements' section but it would be nice to Export a file to an external device then Import it without changes to Exp on a diferent PC. csv format would allow some slight changes i.e. Mark name etc

With all that said, the answer to my original question, does seem to be just use the GPX (Import and Export) from the ribbon.  I tried this Exporting to both a thumb drive and a Garmin device (Quatix) and I could then Import from either device to Exp on another platform.

This is a very nice feature as it allows development of multiple race courses on the home/backup machine then taking them to the boat where you might not have so much time.

Thanks for all,
Ernie