View Full Version : Nautical Mile vs. Statute mile per hour speedometer

01-26-2007, 12:18 PM
Ok, MC is a boat. Is the speed presented NMPH or SMPH? Think the latter, but is there some doc about lake boats vs. open water ships that have the speedometer set accordingly.

My speedo is aligned to my GPS most of the time at the speeds I want, but differs past my ski zone compared to the GPS. Wondering if this is related to Nautical vs. Statute or just differs.

Friday question for the day :-)


01-26-2007, 12:21 PM
It measures statute mph. Should match GPS. Keep in mind that the speed measured is speed over water, not speed over ground as measured by GPS (which does not account for any water flow)