[aprssig] Cheap USB GPS available again

[scott at opentrac.org]

> My limited 
> understanding is that the host part of USB is quite resource 
> intensive, 

Very.  I understand there are some embedded host controller chips showing
up, but so far I've only seen them used for mass storage devices.  I really
need to write a FAQ on this, since I keep explaining it to people asking if
I'm going to make a tracker that uses USB GPS receivers.  Even if you've got
a host controller, you're only half way there - you have to know how to talk
to the device.  Magellan uses a mass storage device, Garmin is proprietary,
and  even if it's plain NMEA you can't be sure what endpoint type it's going
to use.  It's not impossible, but it'd be a major pain.

Scott
N1VG