
Originally Posted by
WaltA
I hate to tell you, that when a portable GPS unit looses it signal (and they do), "you are screwed". The portable GPS unit "simply stops working" too.
And if you don't think a portable GPS unit can loose its reference signals from the satellites, then you haven't used a portable GPS all that much.
That's one of the differences with a built-in GPS unit, which cost $2,000, available on some cars. The built-in GPS unit on my hybrid, will switch over to what it calls 'dead reckoning' when it looses satellite signals. It will use vehicle speed (speedometer reading) and direction (compass) to temporarily start to estimate location, something portable units can't do.
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