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- Global Positioning System (28209 bytes)
1: [[Image:Navstar.jpg|thumb|250px||Over fifty '''GPS''' [[satellite]]s such as this NAVSTAR ...
14: ...cluding the replacement of ageing satellites. The first of 24 satellites that form the current GPS con...
19: ... were initially manufactured by [[Rockwell]]; the first was launched in February [[1978]], and the mos...
23: ... receive signals from four satellites in order to find its own [[latitude]], [[longitude]], [[elevatio...
24: ... three satellites are needed (the point is then defined as the intersection of two hyperboloids and an... - Mobile phone (30513 bytes)
16: ...twork costs are mostly call volume related, while fixed-line telephony has a much higher subscriber re...
18: ...]30), and the availability of relatively low-cost fixed-line networks (around $30 for unlimited local ...
24: ...the carrier will put the customer's handset identifier into its subscriber database so that the handse...
32: ...ures aimed toward personalisation, such as user defined and downloadable [[ring tone]]s and [[operator...
36: ...ual band, tri-mode: [[AMPS]] 800 / [[CDMA]] 800 / CDMA 1900).
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