Dont know if anyone is still reading this, but I have successfully connected my ol' RS Digitraveler GPS to my Axim x50v.
I used the Gomadic x50v to RS232 cable with ComCube.
Gomadic Cable Link
In my case, I had the PDA version of the digitraveler and didn't have a serial cable connection.I followed some simple steps for creating a serial connection using either one of the existing PDA cables, or a simple telephone extension cable,
Found Here .. Ignore the pin 4-6 and 7-8 stuff as they were not needed. Apparently, the Gomadic cable supplies the signal needed on pin 3 to turn on the GPS when you select connect from the Axim.
To use a simple telephone cable, cut one end off and add a female DB9 serial connector using this pin diagram.
+---------+ <- RJ-11, as viewed from the front (non-cable) end
|.........|
|......---
+--|......--- pin 5 ---- female DB-9 pin 5
|..|......---
|..|......--- pin 3 ---- female DB-9 pin 3
+--|......--- pin 2 ---- female DB-9 pin 2
|......---
|.........|
+---------+