Check out Jameco if you just need traffic indicators.
http://www.jameco.com/webapp/wcs/stores/servlet/ParametricSearchResultsView?langId=-1&storeId=10001&catalogId=10001&jameco_page=46&drill_parents=category_root%24%2460%24%246040&drill_children=60%24%246040%24%24604045&drill_displays=Test%2C%20Tools%20%26%20Supplies%20%2F%20Test%20%26%20Measurement%20%2F%20Testers

SInce you have DB-9, you also will need a pair DB-9/DB-25 adapters of 
the correct gender to adapt to the DB-9. I didn't look very far, but you 
might find some that are DB-9 already.

But I note "GPS", are you really wanting to know where you have been?. 
My Lowrance I-finder expedition C does that, it's called a trail, and 
automatically uses either a time period or distance to save trail points.

Brooke Clarke wrote:
> Hi:
>
> I'd like to make a PIC based device that will read an RS-232 data stream and 
> blink a Red or Green LED based on the data.  It would be nice if I could just 
> buy the hardware so question #1 is does it already exist?
>
> To make one I plan to insert a PCB between the two rows of pins on a DB-9 
> connector and solder traces to all the pins.  So far the smallest PIC with 
> built-in serial is the 16F688 at 14 pins.  Is there a lower pin count PIC with 
> serial (I don't want to hassle software bit banging if possible.)  Is there a 
> better choice of PIC?
>
> There used to be a Microchip  Selection_Guide.pdf that had outline drawings of 
> the different PIC packages and listed all the part numbers that you could get 
> in each one, but I can no longer find it.  If it still exists what's the URL?
>
> Since it will be on a serial connector can it be programmed using a serial port 
> on a PC.  (I've heard about self programming but have not used it do don't know 
> the details)
>
> There are spare pins in the GPS receiver so +5 volts can be supplied, but it 
> would be better if the PIC & LED could be powered from the RS-232 lines.  A 
> pointer to doing that would help me decide if it's viable.
>
>   
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