Hi,
>> The source code [1] for GPXSee [2] contains a routine demangle()
which "unlocks" a locked TRE file.
>> I was aware that there are tools which can do that but never saw
open source so far.
The unlock code is on GitHub since 2012 (that's four years before the
GPXSee project has even started). You can create your own locked maps
using non-Garmin software since 2008.
M.
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