The document discusses the history and features of satellite navigation (sat nav) systems. It notes that the first sat nav was the Jones live-map in 1988, which used a cable connected to car wheels to measure distance and direction. Modern sat nav systems receive information from multiple satellites to determine the user's precise location and provide turn-by-turn directions to destinations. The document also lists common devices that contain sat nav systems, such as cars, phones, and iPods, and explains that sat nav was originally developed for the military before becoming widely used for civilian navigation.

2. The second was the
gyrocator It was
computerise.
In 1988 they created
a digital road map
• The first sat nav
was the Jones live-
map
• It was an archaic
way to measure
distance and
direction through
a cable conected to
the front wheels.

3. • A sat nav is a machine that can tell you
which way you need to go by using
information received from a satellite

4. WHERE CAN WE FIND IT?
1. In a car
2. In mobile phones
3. In an ipod touch
WHAT FOR DO WE USE
IT?
We use it to travel to places
that we don’t know how
to go
HOW DO WE USE IT?
To use it you insert the
localization of the place
you want to go and the
sat nav will show you a
map with the direction
you have to go

5. 1) SAT NAV was invented after a disaster
in which two aeroplanes crashed
because they got lost in the middle of
the sky
2) It was invented for the military force
3) More than 30 sat nav satellites are
orbiting around the Earth
4) To get the exact location, the sat nav
uses information from 4 different
satellites