Anyone have success logging GPS Speed into an Innovate LM2 Analog input. It appears the GPS device output digital signal would need to be converted through a "Digital to Anolog Convertor" to a 0-5V non-pulsed linear output. MPH to Voltage calibration numbers would also be necessary.

Watched your post the last day or so out of curiousity. I won't say it's impossible but I'm not aware of a way to it. I mess with data loggers a lot for drag racing and I'm not aware of any data logger that logs mph from gps. All of the companies pretty much use the same or similar sensors to get it done. The good part about an lm-2 is it will log engine rpm and you can lay the rpm graph over the 02 readings (or any type of psi or temp data you are logging) that way. If you make a chart of your boats speed at say every 250 rpm you could estimate mph at a given rpm when you look at the data later Usually if you can log rpm there is no real reason to log mph.