>The GPS in its simplest form is a receive only 4800bps stream.
>Connect it to a pin, and use a timer to trigger an interrupt at
>24,000Hz.  Inside the interrupt do a very simple serial receive
>bit-shift operation:
>
>Wait for the start bit (signal goes low) then wait two interrupts.
>Every 5th interrupt take the current level of the pin, and shift it
>into your receive register.

You can get away with having the interrupt at 3x the baud rate. IIRC this 
has been discussed here before, so a check of the piclist.com archive would 
be worth doing. 

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