Garmin produce among the best Sat Nav units there is, including  the Streetpilot III Foretrex Navi 310 600.. check out this selection fof Garmin SatNavs on eBay for sale..
 
Garmin Zumo 550 Motorcycle GPS New Navigator Receiver

Garmin Zumo 550 Motorcycle GPS New Navigator Receiver

 £478.14 14d 7h 38m
Garmin Zumo 550 Motorcycle GPS New Navigator Receiver

Garmin Zumo 550 Motorcycle GPS New Navigator Receiver

 £478.14 19d 3h
Garmin Zumo 550 Motorcycle Navigation Receiver FM GPS

Garmin Zumo 550 Motorcycle Navigation Receiver FM GPS

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 £441.21
£444.63		 2d 23h 39m
New Garmin Zumo 550 Motorbike Motorcycle Bike Sat Nav

New Garmin Zumo 550 Motorbike Motorcycle Bike Sat Nav

 £429.50 2d 13h 11m
Garmin nuvi 670T

Garmin nuvi 670T

 £409.99 23d 14h 50m
Garmin Handheld Colorado 300 GPS Navigation Basemap

Garmin Handheld Colorado 300 GPS Navigation Basemap

 £396.06 14d 8h 18m
NEW Garmin Handheld Colorado 300 GPS Worldwide Basemap

NEW Garmin Handheld Colorado 300 GPS Worldwide Basemap

 £389.00 14d 8h 18m
New Garmin Nuvi 5000 5.2" Widescreen Lorry GPS Sat Nav

New Garmin Nuvi 5000 5.2" Widescreen Lorry GPS Sat Nav

 £369.50 2d 13h 11m
Garmin Nuvi 775T

Garmin Nuvi 775T

 £344.99 11d 5h 45m
Garmin Nuvi 775T

Garmin Nuvi 775T

 £344.99 10d 10h 12m
GARMIN NUVI 775T GPS SAT NAV USA CANADA EUROPE 2009 775

GARMIN NUVI 775T GPS SAT NAV USA CANADA EUROPE 2009 775

 £359.12 22d 18h 47m
Garmin Nüvi 860T Automotive Bluetooth GPS Navigation

Garmin Nüvi 860T Automotive Bluetooth GPS Navigation

£342.01 1d 8h 27m
Garmin StreetPilot c510D Europe

Garmin StreetPilot c510D Europe

 £339.99 23d 14h 36m
Garmin Nüvi 775T Bluetooth Navigation Automotive GPS FM

Garmin Nüvi 775T Bluetooth Navigation Automotive GPS FM

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 £338.60
£341.34		 5d 23h 9m
Garmin nüvi 775T GPS Navigation Car Automotive V9 +Maps

Garmin nüvi 775T GPS Navigation Car Automotive V9 +Maps

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 £335.18
£338.60		 5d 11h 17m
Garmin nüvi 775T GPS Navigation Car Automotive V9 +Maps

Garmin nüvi 775T GPS Navigation Car Automotive V9 +Maps

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 £335.18
£338.60		 1d 11h 17m
Garmin Edge 705 GPS HRM Heartrate Bicycle Speed Cadence

Garmin Edge 705 GPS HRM Heartrate Bicycle Speed Cadence

 £329.17 24d 6h 10m
New Garmin Oregon 400T Europe Handheld GPS Sat Nav

New Garmin Oregon 400T Europe Handheld GPS Sat Nav

 £329.50 2d 13h 11m
Garmin Edge 705 GPS HRM Heartrate Bicycle Speed Cadence

Garmin Edge 705 GPS HRM Heartrate Bicycle Speed Cadence

 £325.81 25d 4h 52m
New Garmin Nuvi 860T Full Europe Bluetooth Traffic GPS

New Garmin Nuvi 860T Full Europe Bluetooth Traffic GPS

 £319.50 2d 13h 11m
Garmin nuvi 370 + GTM 12 Traffic Receiver

Garmin nuvi 370 + GTM 12 Traffic Receiver

 £324.99 23d 14h 50m
New Garmin Nuvi 775T US & Europe 3D Maps Traffic GPS

New Garmin Nuvi 775T US & Europe 3D Maps Traffic GPS

 £319.50 2d 13h 11m
Garmin Nüvi 765T Car Bluetooth Navigation GPS Europe

Garmin Nüvi 765T Car Bluetooth Navigation GPS Europe

£313.29 2d 9h 1m
Garmin Edge 705 Bike GPS Receiver Bicycle Navigation HR

Garmin Edge 705 Bike GPS Receiver Bicycle Navigation HR

 £313.29 17d 7h 53m
Garmin nüvi 765T GPS Navigation Car Bluetooth Radio MP3

Garmin nüvi 765T GPS Navigation Car Bluetooth Radio MP3

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 £304.40
£307.13		 21h 52m
Garmin nüvi 765T Car GPS Sat Nav 765 T Bluetooth New

Garmin nüvi 765T Car GPS Sat Nav 765 T Bluetooth New

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 £300.29
£307.13		 23h 14m
GARMIN GPSMAP 450s BRAND NEW!!!!

GARMIN GPSMAP 450s BRAND NEW!!!!

 - £299.99 13h 48m
New Garmin Colorado 300 Handheld Outdoor Walking GPS

New Garmin Colorado 300 Handheld Outdoor Walking GPS

 £299.50 2d 13h 11m
New Garmin Nuvi 765T Full Europe 3D Maps Traffic GPS

New Garmin Nuvi 765T Full Europe 3D Maps Traffic GPS

 £299.50 2d 13h 11m
Garmin Oregon 400t Handheld GPS Receiver

Garmin Oregon 400t Handheld GPS Receiver

 £290.00 4d 10h 22m