Actually for accuracy, you require signals from at least 4 birds
simultaneously. With only 3 birds the units cannot solve for time and
location (and 3 space) and have to default the location to sea lever on
the WGS84 (World Geodetic System 1984 datum) geoid. So with 4 (or more)
location in space and time can be calculated and accuracy is improved.
Without at least 3 nothing can be calculated.
In forested areas of mountain terrain drop outs will occure and the
distance calculated by GPS units will be short. This is a particular
problem in easter hardwood forest where the tree leaves are about the
right size for a nice reflector of the GPS signal - proper relationship
between leaf size and wavelength. But of course it can't get through
rock either.
On the other hand it should be fairly easy to integrate GPS into their
unit since GPS chipsets are fairly inexpensive these days, but it does
take some up front engineering and redesign.
Truman
Steve Elliot (Equine Performance) wrote:
Timex sends a different HR transmitter signal than Polar.... the signals
are not compatible. I know riders interest in the Timex GPS system for
horses and how some are trying to adapt the Timex human transmitters to
horse use.
Polar Electro has told me that Polar is working on GPS but they are
concerned about the GPS signal dropouts since GPS require 3 satellites
to be accurate. If you are riding and you lose a GPS signal for awhile,
then the total distance covered shown on the HR monitor becomes
inaccurate.....for example, a 10 mile ride could show up as an 8.5 mile
ride.
Steven A. Elliott
Equine Performance Products/Las USA Sportwear
4181 Spring Ct. Pilot Hill Ca. USA
1866-EQUI-HRM
www.equineperformanceproducts.com
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