Hi Henning,
I believe that Garmin uses a formula for these numbers. At least for
older maps, City Navigator maps are different. It looks like that:
first_mapname = 0x606000 + 2048*family_id
overview_mapname = first_mapname + 2047
I don't think any program looks at overview mapname but GPS doesn't
accept multiple tiles with the same mapname.
--
Best regards,
Andrzej
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