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Our TV is equipped with a CB so we bought a hand held CB and we can communicate in a normal tone of voice- It is not necessary that I can see DW but I find it helpful if I can- We walk the site before we attempt to park- I can point out where the wheels should travel and DW uses that as a guide and instructs me to back, turn and follow- It has worked for us for years although we still have words from time to time- JMHO- Don
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