This is a good read for the smaller HB DI units...(the 597 just has a little wider screen)...
http://www.crappie.com/crappie/fishi...7ci-hd-di.html
Now for the interference on the TM ...everyone's boat setup is different...
The only way to know for sure if your specific setup will have RF...is to mount it and try it...
If you get RF...bring it here and we will do our best to help you track it down...
Rickie


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