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When Serial Isn't RS-232, Geocaching with the Garmin GPS 95
Connecting a Garmin GPS 95 to a Flipper Zero, the serial adventures along the way, and finding the Netherland's first Geocache.
The serial port on the PC platform uses RS-232, a loose standard going back to the 1960s describing the electrical and timing of the signals, but not the encoding of data. It is my understanding that portable device manufacturers did not want to add an extra voltage rail just for the serial port, but RS-232 drivers with integrated charge pumps weren’t yet cheap enough. Since user waypoints can be synchronized with a PC, it would be interesting in the future to write a program that can push a list of geocaches to the Garmin GPS 95.
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