> and drive right into the bay over that bridge
> that your GPS insists exists.

My GPS has no knowledge of bridges.  I look out the window to see if there
are any obstacles.  I just follow drivable paths in the general direction of
the heading shown on my GPS until I arrive.  It is surprisingly efficient,
and I don't need any map at all.

> Where do you think your GPS gets its info?

>From satellites overhead.

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