Humminbird 1158c Combo, Инструкция по установке и эксплуатации

Страница: 17 / 232

How GPS and Cartography Work
Your Fishing System also supports GPS (Global Positioning System) and chartplotting. It uses
GPS and sonar to determine your position, display it on a grid, and provide detailed underwater
information.
GPS uses a constellation of satellites that continually send radio
signals to the earth. The GPS receiver on your boat receives signals
from satellites that are visible to it. Based on time differences
between each received signal, the GPS receiver determines its
distance to each satellite. With distances known, the GPS receiver
mathematically triangulates its own position. With once per
second updates, the GPS receiver then calculates its velocity and
bearing.
GPS was originally intended for military use; however, civilians may also take advantage of its
highly accurate position capabilities, typically /- 4.5 meters, depending on conditions.
This means that 95% of the time, the GPS receiver will read a location within 4.5 meters of your
actual position. Your GPS Receiver also uses information from WAAS (the Wide Area
Augmentation System), EGNOS (the European Geostationary Navigation Overlay Service), and
MSAS (the MTSAT Satellite Augmentation System) satellites if they are available in your area.
The following GPS functionality is currently supported by the Fishing System when it is
connected to the included GPS receiver:
• View current position
• View current track (breadcrumb trail)
• View precision speed and heading from your GPS receiver
• Save tracks, waypoints, and routes
• Travel a route and navigate from one waypoint to the next
See Chart View and SD Memory Card Slots: Add Maps to Your Fishing System for more
information.
5
Introduction