If you run Windows, g7towin pulls the data from my SeaClear II tracks very nicely, and IIRC it reports and exports speeds and distances to a text file without the need for a spreadsheet to do the calculations. It can also handle some of the interfacing with Garmin units, adding additional menu commands into SeaClear II to allow for direct on-demand transfers.
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Formerly posted as "RhythmDoctor"
1998 Catalina 250WK Take Five (at Anchorage Marina, Essington, on the Delaware River)
1991 15' Trophy (Lake Wallenpaupack)
1985 14' Phantom (Lake Wallenpaupack)