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The goal is to get the Tomtom wired GPS unit working with a Linux laptop.
The antenna is said to comply with the NMEA-0183 data message standard and SiRF II binary data protocol
RJ-11 Pinout should be sth like:
It's RS232 COM1 in XDA II
Attention: to check if it's TTL RS232 (0-5V) or plain RS232