Perhaps I missed this, but how did you interface the StreetFinder GPS to the empeg?

That's the beauty of it. It was practically plug and play.

All I needed to do was know which pins on the connector were the RS-232 Ground, TX, and RX, and then connect those to the corresponding pins on the empeg's serial port. One brief moment of trial-and-error deciding whether to have TX/RX crossed or not crossed, and then it worked. All done.

(For anyone with a StreetFinder, I have a photo at home of which pins you solder to, if you want it. But it's easier to just figure it out yourself by looking at the pinout diagram. I don't have the link to the diagram any more but it was posted here on the BBS recently, I think in the original Staples Clearance thread.)