I mean you can compare post n 1 gmap files with Garmin CNNAM manifest that is the source of map update.
for example TYP file
from manifest:
from gmap from post n1:SourceUrl>h t tp://downloadg.garmin.com/RMU/NA/2014_10/IMG/City Navigator North America NT 2014.10.gmap/I0000B68.TYP</SourceUrl>
<RelativeDLPath>/IMG/City Navigator North America NT 2014.10.gmap/</RelativeDLPath>
<Size>1881</Size>
<MD5>9bbb1af0c710c6bd221dfc2c5dc13174</MD5>
MD5: 9BBB1AF0C710C6BD221DFC2C5DC13174
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