Used GPS TomTom, NavMan Sat Nav


You've come to the right place to buy a used GPS or used Sat Nav system. The GPS, typically named Global Positioning System and originally named NAVSTAR, is a satellite navigation system used for determining one's explicit location virtually anywhere on earth. A GPS unit receives time signal transmissions from assorted satellites, and generates its exact position by triangulating the information. Checkout our great deals and grab yourself a discount used GPS or used Sat Nav.

3.5"Car GPS SAT-NAV 2GB NEW&FREE Map Mp3 Mp4 SiRF3 Chip


3.5"Car GPS SAT-NAV 2GB NEW&FREE Map Mp3 Mp4 SiRF3 Chip

Price: £39.99

4.3"GPS SAT-NAV Car system MP3 MP4 with 2GB FREE MAP


4.3"GPS SAT-NAV Car system MP3 MP4 with 2GB FREE MAP

Price: £59.99

SAT NAV GPS AERIAL ANTENNA MERCEDES SONY PIONEER BECKER


SAT NAV GPS AERIAL ANTENNA MERCEDES SONY PIONEER BECKER

Price: £2.41

Car air Vent Mount Holder for TomTom One XL classic


Car air Vent Mount Holder for TomTom One XL classic

Price: £5.15

Hard Case for tomtom go 930 730 530 live 540 740 940


Hard Case for tomtom go 930 730 530 live 540 740 940

Price: £5.45

CAR AIR VENT HOLDER MOUNT FOR TOMTOM GO 530 730 930


CAR AIR VENT HOLDER MOUNT FOR TOMTOM GO 530 730 930

Price: £6.06

car window mount for tomtom go 520 520t 720 730 920 930


car window mount for tomtom go 520 520t 720 730 920 930

Price: £6.06

LEATHER CASE FOR TOMTOM ONE 125 130 130s + SCREEN MOUNT


LEATHER CASE FOR TOMTOM ONE 125 130 130s + SCREEN MOUNT

Price: £6.06

CAR CRADLE MOUNT HOLDER for Tomtom one 3rd Edition v3


CAR CRADLE MOUNT HOLDER for Tomtom one 3rd Edition v3

Price: £6.06

Hard EVA case for tomtom one xl 330 S 920 920T 930 740


Hard EVA case for tomtom one xl 330 S 920 920T 930 740

Price: £5.45

car window holder for tomtom go 530 530t 730 730t 930


car window holder for tomtom go 530 530t 730 730t 930

Price: £6.06

Car air Vent Mount Holder for TomTom One XL classic


Car air Vent Mount Holder for TomTom One XL classic

Price: £5.15

CAR AIR VENT HOLDER FOR TOMTOM ONE 3rd EDITION v3


CAR AIR VENT HOLDER FOR TOMTOM ONE 3rd EDITION v3

Price: £6.06

leather case for tomtom one xl 330 s & easyport mount


leather case for tomtom one xl  330 s & easyport mount

Price: £6.06

Garmin Zumo 55o Motorcycle Car Sat Nav BRAND NEW


Garmin Zumo 55o Motorcycle Car Sat Nav BRAND NEW

Price: £320.00

HANDHELD GPS


HANDHELD GPS

Price: £74.00

Garmin City Navigator Middle East Maps Nuvi Zumo Edge


Garmin City Navigator Middle East Maps Nuvi Zumo Edge

Price: £134.95

Garmin nüMaps Lifetime Map Update Europe mapping Nuvi


Garmin nüMaps Lifetime Map Update Europe mapping Nuvi

Price: £89.95

Garmin City Navigator UK & Ireland Mapping Micro SD 255


Garmin City Navigator UK & Ireland Mapping Micro SD 255

Price: £34.95

Garmin City Navigator NT Northwest Eastern Europe Maps


Garmin City Navigator NT Northwest Eastern Europe Maps

Price: £34.95

Garmin Travel Guide Full Europe 20 countries Nuvi Zumo


Garmin Travel Guide Full Europe 20 countries Nuvi Zumo

Price: £56.95

Garmin City Navigator Europe NT France Benelux Map Nuvi


Garmin City Navigator Europe NT France Benelux Map Nuvi

Price: £34.95

Garmin City Navigator North America & Canada DVD Zumo


Garmin City Navigator North America & Canada DVD Zumo

Price: £49.95

Garmin City Navigator Spain & Portugal Maps Micro SD


Garmin City Navigator Spain & Portugal Maps Micro SD

Price: £34.95

Garmin City Navigator Brazil Maps Micro SD Nuvi Zumo


Garmin City Navigator Brazil Maps Micro SD Nuvi Zumo

Price: £79.95

Garmin City Navigator Europe Map Micro SD & SD Nuvi 250


Garmin City Navigator Europe Map Micro SD & SD Nuvi 250

Price: £62.95

Garmin nüMaps Lifetime Map Update North America Nuvi


Garmin nüMaps Lifetime Map Update North America Nuvi

Price: £79.95

Binatone C350 Car sat nav


Binatone C350 Car sat nav

Price: £45.44

Florida Ticket


Florida Ticket

Price: £15.00
Price: £20.00

GARMIN ZUMO 660 MOTOCYCLE CAR EU GPS SAT NAV RRP £549


GARMIN ZUMO 660 MOTOCYCLE CAR EU GPS SAT NAV RRP £549

Price: £421.00


GPS Sat Nav


The GPS normally consists of 24 satellites in 6 orbital planes. Each satellite circles the earth two times every day. The satellites hold atomic clocks and continuously transmit the exact time, along with several other administrative information. The receiver does not necessarily need a precise clock, but it needs to have contact to four satellites in order to unambiguously compute its individual latitude, longitude, elevation and the explicit time. By comparing the signals from 2 satellites, the receiver can compute the diversity between the distances to the 2 satellites. Because the receiver also understands the exact locations of the four satellites, 3 such differences allow a system of 3 (nonlinear) equations for the 3 unknown latitude, longitude and the elevation. As soon as the receivers location and therefore distance to the satellites are known, the time signal sent out by 1 of the satellites allows to compute the exact time at the receiver's location. If elevation information is not essential, only 3 satellites need to be contacted.