Ever wonder how ships know where they are going on the open sea? In the ancient times, it was the stars & compassed that guided the ships in mysterious waters. Today the marine technology is amazing as there is GPS technology that can pinpoint the location of any ship or water vessel out in the wide open ocean. Here are some that are listed on ebay now...
 Standard Horizon Matrix GX2000 VHF Optional AIS 30W PA  US $199.95
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 New Garmin VHF 300 AIS Radio Black US $862.49
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