It sounds like your GPS receiver does not have a good view of the sky, because of the limitation of the H2s vertical windshield. I suggest you buy an external magnetic GPS antenna. The more satellites your GPS unit can "see" the more accurate it will be.
I had the same problem with my in-dash nav. I now have my nav unit using the roof mount GPS antenna that was connected to the OnStar, which I junked to install the 6-CD changer.
You can test this theory by putting your Garmin in a vehicle with a more conventional windshield. Remember, GPS signals are line of sight only, and very weak.
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