I purchased this to replace a 200 model. It works just as well but
not any better than the previous model in that you can always follow the
arrows to find your dog but the compass seems to have trouble staying
oriented to the north. I am needing to recalibrate often the so called
3rd axis where you can read it with it vertical is no better than the
old one. All in all if you need a dog location device the Garmin Astros
are the best on the market but save some money and get the previous
model. If you are like me and had an older model the upgrade is not
worth it wait for another upgrade.
http://www.lowcosttoday.com/garmin-astro-320-gps-tracker-for-sporting-dogs-bundle-us/