transducer ? cp450c upgraded to cp470

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Great. Thanks for response. Actually just got it in the boat and hooked up. It appears the sonar is sounding and have depth, but my screen is blue and says selected sounder is unavailable. I am in the process of downloading the updated software to see if this helps, but wanted to post the ?. I have a trip planned in the morning and hoping to get this working. Thanks in advance. Craig