Furuno help??

bluefin650

Commander
Joined
Sep 5, 2011
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Location
Southern Maine
I have a new to me RDP-139. I have a new bathy chart installed. I cannot for the live of me figure out how to get more contrast between the chart and the contour lines. The manual talks about the contour soft key but I don't get that option with anything I have tried. I am hoping that someone with more experience can help me out.

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