Today’s GPS receivers are extremely accurate, thanks to
parallel multi-channel design. Garmin’s 12 parallel channel
receivers are quick to lock onto satellites when first turned on
and they maintain strong locks, even in dense foliage or urban
settings with tall houses. Certain atmospheric factors and other
sources of error can affect the accuracy of GPS receivers.
Garmin® GPS receivers are accurate to 15 meters on average.
Newer Garmin GPS receivers with WAAS (Wide Area Augmentation
System) capability can improve the accuracy to less than three
meters on average. No additional equipment or fees are required
to take advantage of WAAS. Users can also get even better
accuracy with Differential GPS (DGPS), which corrects GPS
signals to within an average of three to five meters. The U.S.
Coast Guard operates the most common DGPS correction service.
This system consists of a network of towers that receive GPS
signals and transmit a corrected signal by beacon transmitters.
In order to get the corrected signal, users must have a
differential beacon receiver and beacon antenna in addition to