I use Skydroid too but it's only as good as the people who mapped the courses. How it works is that someone who knows the course logs onto the Skydroid website, uses Google maps to place 3 markers on each green for front, middle and back. That user can also, if they choose, mark various hazards but it may or may not be done.
So...if you're not going to map each course you play by yourself, major accuracy can't be guaranteed. Having said that, I've had pretty good luck with each course I've played. I've also mapped a course and it's pretty simple, just takes a little time.
Anyway, just wanted everyone to know exactly what they're getting. It's worth the small pricetag IMO.