So I made a really simple globalmapper file that only contains one contour line with an elevation of 100 feet. If I export it as an MP file, it is interpreted as 100 meters and converted to feet however. This is the contents of the MP file
[IMG ID]
ID=90007259
Name=
Elevation=F
LBLcoding=9
Codepage=1252
Marine=N
Copyright=
Preprocess=F
;TreSize=3000
POIIndex=Y
Transparent=N
Levels=4
Level0=24
Level1=22
Level2=20
Level3=18
Zoom0=1
Zoom1=2
Zoom2=3
Zoom3=4
[END-IMG ID]
[POLYLINE]
Type=0x22
Label=328
EndLevel=2
Data0=(39.9683342,-74.5985947),(39.9684372,-74.5986328),(39.9686165,-74.5988235),(39.9688721,-74.5993118),(39.9691048,-74.5996323),(39.969635,-74.6000214),(39.9697113,-74.6001434),(39.9697533,-74.6004105),(39.9697342,-74.6005936),(39.9696045,-74.6007767),(39.9695053,-74.6007996),(39.9694366,-74.6007767),(39.9692917,-74.6003647),(39.968895,-74.5998383),(39.9687614,-74.5995102),(39.9686546,-74.5993347),(39.9682503,-74.5988159),(39.9682388,-74.5986404),(39.9683342,-74.5985947)
[END
]
But if I export it as a shapefile, this is what appears in the .dbf. (see attached). I must be missing some globalmapper preference, but I can't find it and never had this problem before.