GPS Power Requirements

[Jonathon Suggs]

There has been a lot of talk about GPS recently.  There are some really
good ideas floating around, but before people start getting really
excited the BIG question is what is the power draw on the device?  Will
you be able to keep the GPS receiver on constantly without having the
battery get drained in a few hours?  If so, then *most* of the ideas are
going to be pointless.

For instance, having the device be able to do specific things when you
come into a certain area (100m from home = queue up music, 100m from
school = turn off cell phone or just mute, etc).  Those are amazing
ideas that could make this platform really stand out (if the interface
is done correctly).  But if you have to remember to turn on the GPS when
you get close to those areas for that feature to work will completely
defeat the point.

So, what is the power requirements for GPS.  Is it a constant draw or
can it be improved via advanced/better  drivers (polls less frequent if
stationary, etc).