GPS in an embedded system

To implement a project to use GPS in an embedded system, I need to read a vector map from an SD card, and display it on a small 2.6-inch TFT display. Since the file size of the card can be up to 500MB, I need to extract the most needed data from the origin card.

At first I thought about using .pbf files, but ran into the problem that Garmin uses its own file system. I can’t figure out what to do next.

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