@zhang965 no, i have the spartan trainer, its spot on, just using it the way it came out of the box, the altitude is not quiet perfect (in a 25k run, it should have been 520m, and it registrated 429m) but it has no baro so… no big deal to me.
bought it specialy for the gps/navigation, and it does a perfect job!
plant a gpx in it, go to the woods and have some fun, life can be so good 🙂