[aprssig] power on DB9 connector standard for trackers?

[Jason Winningham]

Is there a standard for a tracker supplying power to a GPS via a DB9 
pin?

For example, the Opentracker has a jumper to pass Vin from pin 7 on the 
radio side DB9 to pin 4 on the GPS DB9, but this appears to be 
unregulated.

I thought I remembered a reference to a regulated voltage on pin 9, but 
I can't find it now.

It's not a big deal, but while I'm building a tracker housing and GPS 
cables, I figure I may as well adhere to a standard if there is one.

-Jason
kg4wsv