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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Mark_M
CASIC AID-INI is probably for other data. In the .bin file there are 32 MSG-GPSEPH (0x08 0x07) messages, for each GPS satellite. Then one MSG-GPSION (0x08 0x06) and one MSG-GPSUTC (0x08 0x05). The last one I'd probably re-craft with more current time, if it will work.
All messages already have checksums pre-calculated. They are ready to be pushed to the chip.
The only my concern is, they need to be pushed one by one, after ACK for each message is received. That is how it is stated in the doc.