GLONASS-enabled chartplotters
prices on 9 models— this function is usually provided in models with a GPS module (see the relevant paragraph). GLONASS is the Russian equivalent of the American GPS satellite navigation system. And support for two systems at once provides a number of additional features: firstly, the accuracy of determining coordinates is increased and the number of errors is reduced, and secondly, a backup option is provided in case of a serious failure in one of the navigation systems.
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