Performancewise, the Garmin StreetPilot i3 proved to be a worthy road companion. We had to wait 4 minutes to obtain a 3D fix (four satellites) the first time we powered it up, but subsequent starts took just a matter of seconds. More important, route calculation was swift and precise, as was rerouting when we strayed from our original course. The receiver and built-in antenna did an admirable job of tracking our position; we maintained a strong signal throughout most of our journey, losing it only when we traveled through a heavily wooded area in the mountains of upper New York state. Voice directions were clear, providing plenty of warning as we approached an upcoming turn, and our location on the map was accurate.
We like the fact that the Garmin StreetPilot i3 also runs on replaceable batteries, enabling you to use it on foot as a city guide or hiking navigator. Two alkaline batteries gave us 5.5 hours of power--just short of the rated 6 hours--before they ran out of juice.