Uniden UM725 Fixed Mount Marine VHF Radio - BlackUM725 Fixed Mount Marine VHF Radio Black Full Featured VHF Marine Radio with Private Text Messaging Send messages over Marine Channels to other capable radios. 25 Watt Fixed Mount Marine VHF Radio. Uniden is the first to offer text messaging using marine VHF radio. You and your crew will enjoy the privacy of texting boat to boat, rather than broadcasting over your radio for all the boats in your area to hear. The UM725 marine radio comprises the