Garmin Nmea
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 USED ONLY ONE TIMEGarmin eTrex Vista HCX GPS Receiver  US $149.99
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I have a Garmin Nuvi 255w GPS, is it possible to get it to output an NMEA GPS String ?
if you mean like a constant output of data on the USB connector... well I don't think so. (but there are cheaper versions of GPS only receivers that can do that, sending data through USB or Bluetooth).
if you only need to record NMEA data in a .csv (kind of) file, then you'll have first to "unlock" the device, then to install a software that can do that (visualGPS for example).