By Rich Owings at www.gpstracklog.com.
Is your GPS not locking onto satellites? There’s usually a simple solution that works for both auto and handheld GPS units, but first, let’s look at why this is happening.
The science of GPSGPS satellites are always on the move – they are not geostationary. If your GPS receiver knows where to look for them, it can speed reception. The satellites transmit several signals, one of which is almanac data, which provides the orbital information for the satellites in the system.
To read the rest of Rich's post go here.
Rich Owings post is almost two years old and technology changes. For example, the newer smart phones can be complete stand alone receivers and do not require a cell tower.
Taking your time and paying attention to one's navigation is fundamental to backcountry navigation. When I rush my navigation I make mistakes.
Though I have written this before, Rich Owings has a great site and should be check often.