Convert between Latitude/Longitude & OS National Grid Reference points
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How Big is a Degree? – State Cartographer's Office – UW–Madison
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MOTOR METER RACING GPS Sensor Signal & Converter Kit For Electrical Speedometer | eBay
MOTOR METER RACING GPS Sensor Signal & Converter Kit For Electrical Speedometer | eBay
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Generic DC 12V To 5V Inverter Converter Micro Mini USB Hard Wired Car Power Charger For GPS Phone DVR Recorder Camera 1/3 Meters @ Best Price Online | Jumia Kenya