Hi all, Have checked the archives and was unable to find any reference to the Speedtech Speedmate Knotmeter/Log. Has anyone out there used them, and if so, how have they performed? Are you pleased with them and where did you locate the impeller housing? I just picked one up from a chandlery at half-price.(new and unopened). The idea that no thru-hull hole is required made me pleased. We always have used our GPS as a knotmeter. Many thanks,