A good serial port scanner?

I have a DeLorme Hyperformance Earthmate GPS witha serial attachment. I want to use it with my Itronix handheld. Unfortunately, the DeLorme is not NMEA compatible and thus most applications can't read it. I ahve yet to find any CE program that can decipher the strings.
I'd like to use some sort of terminal program that would allow me to convert the binary strings into meaningful latitude and longitude...maybe even a free map software where I could export them to.
The Itronix uses CE Pro and has a MIPS CPU.