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I am trying to implement GPS receiver in software. Can I use AGPS file for faster locking of GPS satellites? I read somewhere that EPO files exist for Assisted GPS but I can't find any place to download this EPO data.

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It looks like GPSrChive distributes a tool (see "Get EPO" at the bottom of the page) to download the files that Garmin receivers use.

I've no idea if the format of the file will be obvious/documented or if the utility is trustworthy. Use it at your own risk.

Presumably the tool is (supposedly) doing something relatively simple to ask Garmin's servers for the same file a Garmin GPS would request on its own.

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