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I cannot trace the problem to the Navionics chart card as it was not removed or updated and the same display issue occurs with the Sonar and Video feed, only the Radar page functions correctly. I have other Navionics region cards I will test to see if the problem persist and will post a photo.

The backlights in the unit went out last year and were replaced along with the LCD screen by Max Marine Electronics, but the E120 itself is operating with no issues.

Could there be a display driver, aspect ratio change or video card issue that could cause problems in RNS? I did change out the touch screen to a Planar Helium PCT2235, but again not sure when this issue may have started over the last 6 - 8 months as the vessel was not in use.

Appreciate your time, thanks.