Able to receive signals from all existing and planned satellite constellations (GPS, GLONASS and the European Union's Galileo system), the GR-3's 72 universal channels can track up to 36 satellites simultaneously. Powered by two rechargeable lithium-ion batteries (3900 mAh, 7.2V) that provide 14 hours of operation between charges, the unit also has an extra battery mounting location and accepts AA batteries for emergency operation. Batteries can be “hot-swapped” during operation without loss of signal or position lock. A dual lithium-ion battery smart charger handles the delicate task of charging the batteries and doubles as an external power source.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.