I suggest the new option should be named /reuse=<comma separated list of
files, wildcards enabled>. /exampel /reuse=40000001.img, 40005*.img. /If
this option is used, then mkgmap should not overwrite the listed folders
in the <name>gmap. Naturally mkgmap should writea new tdb, preview.img,
mdr and idx. In most cases the /reuse folders /contains Contourlines or
other static content.
Thomas
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