Low Power Consumption- 55mA/12V
On-board Power Supply- 4.5 to 16V

Looks perfect, you can hook it's power line (whatever goes to the ps2 port) directly to pin4.
Currenly I'm using GGA, GSA, GSV and from the other sentences it looks like it is the rockwell Zodiac chipset that dbrashear sent me the documentation for. It is probably identical to the chipset in the Palm III streetfindere, maybe even the same thing in different packaging.
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40GB - serial #40104051 gpsapp