"The GPS
signal strength measured at the surface of the Earth is about
-160dBw (1 x 10^-16 watts), which is roughly equivalent to viewing a
25-watt light bulb from a distance of 10,000 miles."
Since it is a pretty weak signal, it is hampered by just about
anything that is denser than air! I have definitely seen the
precision degrade under a dense canopy of trees and in canyons (both
natural and manmade). A concentration of overhead power lines
will also give you fits (anybody have a link to a good explanation of
the physics of that phenomenon?)
Tim
Team AZFastFeet
Being new to GPS receivers I am curious
about sensitivity. My receiver is a cheaper magellan model. It doesn't
work inside buildings or airplanes. Are there any receivers that work
well anywhere?
Mark