I currently have a c90w Display And most of the time my zoom out and in button will not zoom in. My question is I have the following electronics in my boat B60 XDUCER 20DEG TILT,DSM30 DIGITAL ECHO SOUNDER,RD418HD 4KWCOLOR RADOME,SR SIRUS RECEIVER/HS SWTICH, and The C90W DISPLAY US that is given me a pain most times..and I have had it looked at a repair shop and they said it needed a software upgrade well that did not work... my question is what unit can I upgrade to with out changing everything? and what cables would I need
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