Garmin C510/530 GPS Hack

Phil Hornby has published a step-by-step guide for hacking the Garmin C510/530 GPS units to make the ‘text to speech directions’ feature available on them, just like the newer Garmin C550 and C580 GPS units.

“The C5xx range share the same firmware. How much hardware is different between the models is a subject for debate - but there is obviously enough for the firmware to recognise which features should be enabled and which shouldn’t. For example, the playing of MP3’s requires no extra hardware at all - but you can’t do it on the C510. Not that I’d want to. Or maybe I would, if I could ;-)”

[source]