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Reply to "GPS SYnc and another firmware upgrade."

It wont work because you don t have a sync signal.  You also have to know that that the timy is getting his time from a prioritary GARMIN INSTRUCTION  "GPRMF" which is a non standartd NMEA0183 instruction. 

The GPS has to support the GARMIN NMEA instruction and have a SYNC pin/wire

 

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