We are still shipping! However, order processing may take longer than usual and we cannot guarantee same day shipments due to staffing guidelines from the CDC. Please see all COVID-19 updates here. Thank you for your continued support.


Member Since: October 20, 2008

Country: United States

  • I think you don't have much to worry about in terms of buoy motion. Modules like this are at the heart of recievers used in cars, and such units maintain lock under vehicle motion that is more extreme than what a buoy would experience. (GPS works fine in a jet going 500 mph, too.) This unit should work nicely for your application -- just keep it above the sea surface, and I don't just mean dry. Water will severly attenuate a microwave signal and compromise lock.

  • I also needed to switch the TX and RX pins in the example sketch when using it with the EM406.
    Also: Be sure to set your terminal (or the Arduino's serial monitor) to 115200 baud even though the EM406 itself is communicating at 4800 baud.

  • I did some fields measurements.
    - unit stationary
    - clear sky, no obstructions
    - position sampled 391 times
    Radius of circle enclosing 50% of the samples: 0.76 m.
    Radius of circle enclosing 95% of the samples: 2.05 m.
    All measurements were within a 2.3 m (lat) X 2.5 m (lon) rectangle.
    1. The circle centers are the sample mean. The sample mean itself was in error by about 1 m, per inspection on gpsvisualizer.com.
    2. The unit has a resolution of 1e-5 lat/lon, or about 1 m.

No public wish lists :(