Well I do, not sure if its accurate and I don't care! I sure liked the results today running my Formula 303 with 502's,

Did you forget to reset from the truck? Lol. J/j. good run!! They are pretty accurate, I matched mine up to my GPS speedo and chartplotter. Phone just took a lil longer to update speed

My friend's was way off. It was about 7 mph too high. I'm like, dude, it would be nice but my boat can't go that fast. Others have posted that they weren't accurate but if you don't care if it's accurate then I guess it doesn't matter! I like the app that you use in your vehicle that judges your driving skills. I wonder if it calls 911 to report a reckless driver if your score is too low.....

I will not lie i was going down river LOL but it still said it!! conditions were right with a light to moderate chop for some extra lift boat is de sumered, no bedding or amenities just a few beers in the fridge 1/2 tank me the wife and kid, 65 out with 58 degree water

wish i remembered to take out the extra anchor lol

its within 1 mph on my truck

its always been close on everything I've tried it on from my boat, truck, car, to all my friends boat been within one mph

The "just speed" app is dead nuts. Displays in tenths with just a little lag as mentioned.

Maybe he swung the phone around or something to throw it off. He was holding it. It seems like they should be accurate but when we tried it, it was way off. Anyway, congrats on hitting 80!

I have tries a few. They are within a mile per hr give or take to a GPS Speedo or a hand held. Pretty accurate.