[TG] RS 130 GPS Antenna

[AndrewSimon]

I am having problems with my E120 W. Sometimes it shows the heading perfectly, sometimes it shows the heading up to 120 degrees off course. When shown as the red vector line, sometimes it aligns with green vector line, sometimes it's way off. Replaced fluxgate compass last winter, green vector line and autopilot work perfectly on "auto". When red vector line working correctly can set autopilot on "track" and works perfect. When red vector line shows incorrect heading in relation to actual boat direction, setting autopilot to "track" will turn boat but not follow correct track.

I think problem is in RS 130 antenna. Is there a battery that needs to be replaced in the antenna? Am I on the correct thinking antenna is the problem?