Gps for Unmanned surface vehicle

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We are building an nnmanned surface vehicle and now we have to chose the best gps.

what is the best u-blox model gps that works best at the sea and is also accurate?

what u-blox model you guys suggest?
by smindler asked Feb 3
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0 votes
Define accurate. Most deliver 2.5-3.0 metre CEP numbers. And most of that comes from good antenna placement, and an effective antenna.

The NEO-M8N supports multiple constellations, GPS+SBAS, GLONASS and GALILEO
by clive1 answered Feb 3