Thanks everyone for the recommendations. Fortunately, this turned out to be a user error. The good folks at West Marine have seen this problem frequently on the Uniden radios - there is a MemUIC button which makes it very easy to toggle between USA Canada and International VHF frequencies. In my case, it was running on International VHF band whatever those are which created the disconnect regarding frequencies. Now if all my boating problems could be so easy to fix. Thanks again, Kurt