You got it. A GPS watch will be the easiest way to get an accurate measurement of the course. If you want a quick and dirty way, you could drive it on your bike or your car.

I use runkeeper on my iphone. If you look at the map on runkeeper and zoom in, the map points are often off. I can edit the map and put the points visually closer to the actual route, but that's a lot of work. I use mapmyrun to determine the actual distance for a the route. runkeeper is just not reliable, so i use it as an easy way to keep track of which days i ran and approximate mileage. there are times it's accurate like the 5k race i ran recently it was 3.1mi exactly, but that doesn't happen a lot.

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