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May i know what is the difference between the free topo garmin map in GPSfileDepot and free topo map in other mapping interest groups like openstreetmap.org? Thanks!

Thanks jolly47roger and Boyd for your explanation.

Have nice weekend.

Dear Boyd,

Thanks so much for enlightening me.

Can i just ask you one more question which has puzzled me despite surfing around for info.

Understand that routing and way-points are usually stored in non-non proprietary file format (like GPX) which can be easily converted into other format using software like gpsbabel so that anyone can create and share their routes in various platforms (be it dedicated GPS units or phone based apps). I guess i am wrong again this time round

How about maps? Can proprietary maps be easily converted from img to imi etc?

Thank you!!

Hi,

i am a newbie to GPS technology.
i am curious about the different between proprietary map (paid map on sale in Garmin website for example) and free maps (which can be dl from mapping interests groups like gpsfiledepot and openstreetmap).

Understand that proprietary map receives their mapping data from from national mapping agencies like U.S. Geological Survey and Ordnance Survey. Where does open source / free maps receive their mapping data from?
Thank you.