Road Angel 6000 User Manual - page 52
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12. Background Information
About Global Positioning Satellites (GPS)
Operational since 1990, 24 satellites orbit the earth at a height of 11,000
miles. At any given point on the globe, at least 4 satellites are in view at
any one time. Using sophisticated aerials and triangulation techniques,
units such as ROAD ANGEL Navigator are able to compute your position to
within 5-10 metres. ROAD ANGEL Navigator is equipped with a Sirf3
chipset, which enables fast and deep GPS signal search capabilities.
Occasionally, when roads are close together, ROAD ANGEL Navigator
may place you on the wrong road. If this happens, keep driving and ROAD
ANGEL Navigator will automatically correct itself when it has a better fix or
when the road network simplifies.
ROAD ANGEL Navigator may lose the GPS satellite signal temporarily
owing to tunnels, tall buildings, bridges, dense foliage or adverse weather
conditions. When you are clear of the obstruction, ROAD ANGEL Navigator
should re-acquire satellite signals in a few seconds.