11.1: Navegación
- Page ID
- 106717
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Debo bajar al mar otra vez
Al mar solitario y al cielo
Y todo lo que pido es un barco alto
Y una estrella para guiarla
- Fiebre del mar por John Masefield
¿Cómo determina un capitán la posición de un barco en medio del océano? En nuestra era espacial, esto se hace fácilmente, utilizando el sistema GPS de satélites, el Sistema de Posicionamiento Global (http://www.phy6.org/stargaze/Satell5.htm#q150). Esa red de 24 satélites transmite constantemente sus posiciones, y existen pequeños receptores portátiles que convierten esas señales en posiciones precisas dentro de al menos 15 metros o aproximadamente 50 pies.
Antes de la era espacial, sin embargo, no era tan fácil. Uno tenía que usar el Sol y las estrellas.