Re: [Az-Geocaching] GPS Sensitivity

"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