The Veethree GPS Receiver is the most accurate solution for converting an existing electrical speedometer into a GPS speedometer.
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Standard GPS with 1-second (1Hz) update rate that outputs NMEA 0183 info.
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Fast update GPS with 1/10-second (10Hz) update that outputs NMEA 0183 info.
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Fast update GPS with a 1/10- second (10Hz) update that outputs 8- or 16-pulse signal to drive existing electrical speedos on the market.