Crazy reading in DC

I drive through Washington DC a few weeks a go, and at one point on
the beltway my GPS (Garmin C330) went really crazy, the map became
wrong, and it urged me to start doing a U-turn. It recovered in less
than a mile and I didn't think much about it.

Well, coming back on Thanksgiving weekend, the exact same thing
happened in the exact same spot (never elsewhere). Since it obviously
couldn't be a satellite issue, I would think it must be a WAAS or
local correction type of error.

Just wanting to increase my knowledge of how GPS works, can anybody
possibly explain what was going on?

Thanks, Bob
.

Relevant Pages

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