Thank you all. I have made some more experiments and can confirm what Neil said: the original post and wiki entry are correct (except gmapprom1.img doesn't work with the 660) and no additional img files can be used on my Zumo 660.
@ lolypop000: I have tried both *1.img files and they don't work for me.
@ Neill: gmapprom1 is 9 characters and all other Garmin file names are max. 8, so that is already unlikely to work. I tried it anyway...
@ Roger:
1) No, I'm one version behind, as the new version doesn't have any fixes applicable to my unit (language).
2) Initially not. I have found that this base map interferes with the display of OSM maps when zoomed out. Since you suggested it I tried it anyway.
So, thanks to all for your hints. I went the Mapsource way and this would have worked, had we been able to get to Malaysia. A funeral got in the way.
Kind regards,
Peter.
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