You're trying to open a .Dta file you've received through an email attachment or a file on your hard drive, but your computer won't let you do it. You get an annoying pop-up window that says, "Windows can't open this file". How To Open Dta File
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The Vesper Marine WatchMate Vision is arguably the most advanced Class B AIS transponder ever built, and was honored with an Innovation Award in Miami.