RL80C - NO FIX

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HI Chuck,
Yes, I do understand that my unit has an external GPS sensor, I'm just not familiar with how it integrates to the head unit. My unit also has depth and temperature, those go through another module. I wasn't sure if I could just replace the antenna.
It seems it would be best to replace and integrate with the Raystar 130 GPS Sensor if i determine the sensor is the issue.
I will get all information this weekend.

Thank you for your help
Joe