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OK, I'm happy.  Thanks a lot for the help, guys.

Well, I clearly should have done some homework before starting this thread.  I'm obviously confused about a lot of things.

Somehow I got a map from gpsfiledepot (I now suspect maps/view/42) and did something or other with basecamp on a windows machine.  I could not succeed in combining it with my US topo on the 60csx for reasons that I now understand, not realizing that I needed mapsource, nor that a version was available from gpsfiledepot that would run on Windows 7.  However, somehow I did manage to get the map into basecamp and somehow got it out in img format.  How I did this is a complete mystery - perhaps I even succeeded in loading it on the 60csx and then renamed it off of the SD card.  Then, turning to a linux machine, I used gmt to combine it with my existing US topo, making a gmapsupp.img, and I've been happy ever since, except for the dots.  Getting old sucks, but at least I can still hike.  Apologies for all the confusion.

Oh gosh, you are right...  Sorry!  Wait a bit while I figure out what the heck I have and where I got it.

It's called "hawaii_map.img", I guess it's maps/view/42.   I think I used basecamp to do the install thing on hitopo_install.exe and although I've found basecamp to be pretty useless for making maps, it did create the img file.  I then added it using gmt to an old USA topo called "us_topo.img" I bought for the Garmin years ago.  I apologize for all the confusion, too much multitasking.

I'm really not skilled at all with this windows installer stuff - it really confuses me.  On the other hand, writing a C program to identify strings in a binary, remove extended ASCII, and change them to upper case, that's easy.

Thanks, guys.  My 60csx is definitely using the map from Boyd, maps/view/239, it's an obvious change from the previous map and it's the only one in the unit.  Apart from the dots in the labels it works very well.

I've done a bit of looking at the binary map image using various unix tools and I can see all the strings for the text, so I may just do an upper case replacement of lower case (and ascii-256) characters as you suggest.  If the characters are really raster maps this won't work, but I do think it should work.

The 60csx is really an excellent GPS and my budget does not permit updating it, but I was hoping that the binary map could be remade from the source in a way that allows the 60csx to render all the labels properly.

Again, thanks for the advice.

I love Boyd's map of Kauai, I use it all the time for hiking in Kokee.  However, on my GPS 60CSX the lower case characters render as dots.  My understanding is that is because the names use the 255 character extended ASCII set and/or some sort of internationalization flag is set when the map is created.  Is there any chance of making a version that will work with the 60CSX?  Maybe change the flag (if such exists) or swapping a backtick "`" for a "left single quote" <91>?