Massa dependents del GPS <a href="http://www.ibtimes.com/articles/120664/20110309/gps-gnss-navigation-systems-satellites-royal-academy-of-engineering.htm">http://www.ibtimes.com/articles/120664/20110309/gps-gnss-navigation-systems-satellites-royal-academy-of-engineering.htm</a><br>
<br>Raf<br>