Brunton atlas Guía De Operación

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Like most GPS receivers, Atlas doesn’t have a magnetic compass or any other
navigation aid built inside. It relies solely on the signals from the satellites to
calculate a position. Speed, direction of travel, and distance are all calculated
from position information. Therefore, in order for Atlas to determine direction of
travel, you must be moving and the faster, the better. This is not to say that it
won’t work at walking or trolling speeds — it will. There will simply be more
"wandering" of the data shown on the display.
GPS is plenty accurate for route navigation, but the U.S. Federal Aviation
Administration has special needs for aircraft traffic control that go beyond basic
GPS. The FAA has a plan under way to boost GPS performance even further
with its Wide Area Augmentation System, or WAAS. This GPS add-on will
include a time control element that will help airliners fly closer together while
avoiding collisions. In addition to carefully spacing airplanes along travel
corridors, WAAS will eventually make instrument landings and takeoffs more
accurate as it replaces existing aviation navigation systems.
Non-aviators can use WAAS signals to make their GPS navigation even more
accurate. Your Atlas receives both GPS and WAAS signals. However, WAAS
has some limits you should know about.
First, the U.S. government has not completed construction of the WAAS
system, so it is not yet fully operational. The ground stations are in place, but
only a few of the needed WAAS satellites have been launched.
WAAS  can boost the accuracy of land GPS navigation, but the system is
designed for aircraft. The satellites are in a fixed orbit around the Equator, so
they appear very low in the sky to someone on the ground in North America.
Aircraft and vessels on open water can get consistently good WAAS reception,
but terrain, foliage or even large man-made structures frequently block the
WAAS signal from ground receivers.
You'll find that using your GPS receiver without WAAS is both easy and
amazingly accurate. It’s easily the most accurate method of electronic
navigation available to the general public today. Remember, however, that this
receiver is only a tool. Always have another method of navigation available,
such as a map or chart and a compass.
Also remember that this unit will always show navigation information in the
shortest line from your present position to a waypoint, regardless of terrain! It
only calculates position, it can’t know what’s between you and your destination,
for example. It’s up to you to safely navigate around obstacles, no matter how
you’re using this product.