Bests & Worsts Reviews from Amazon

This is just a quick note to remind people of the realistic capabilities of the gps 3 series and all other units. In the amazon/usps TV ad, the guy is running around his house playing with a new gps3 or 3+. These units function great, and will tell you how far it is to cleveland etc, but they DO NOT function inside buildings. GPS satelite signals are very weak, and even when you are outside, if you are near a large building or under lots of trees, your reception can be poor. The is not the unit's fault, it is the radio frequencies assigned by the gvt. If you use it in areas that recpetion is poor, the gps3 series is a good choice because it has an easily removeable antenna which can be placed on an extension cable for a small improvement, or replaced with an amplified antenna for a big improvement.