[OSM-newbies] Getting from OSM to Garmin

[Ian Wills]

Here is my problem: I have edited a map (Lord Howe Island to be precise
permalink:
http://www.openstreetmap.org/?lat=-31.5467&lon=159.0684&zoom=13&layers=B000FTF)
and I now want to get the map onto my Garmin Oregon 300 but, try as I might,
I can get it there but I can't see it.

This is what I did:
1.  Downloaded the map with JOSM.
2.  Saved as a *.osm file.
3  Converted this to an *.img file using mkgmap.
4. Loaded the map onto MapSource using MapSetToolKit.exe.

Having got to this point I can I can view it in MapSource and can upload it
to my Oregon 300 and view it there provided it is the only map I have on the
unit in gmapsupp.img.

Lord Howe Island is a stunning place but it is only small (10 km end to end)
and I would like to have more of the world available. No matter what I do,
although I can combine this map with others and upload them, and can view
other maps, I cannot see this one.

I have tired combinig it with other maps using both MapSource and
GMapTppl.exe with the same result. I have successfully tested this process
with another island, not drawn by me which I can view when loaded with other
maps so I know that it should work in principle.

I have spent many hours on this and would appreiate any words of wisdom.
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