Compare function, free to set upper and lower deviation, red and green indicator light and buzzer sound and light alarm settings automatically;
比较功能，上下限偏差值自由设定，红绿指示灯及蜂鸣器自动声光报警设置；
Powerful: 500 destinations, 20 routes, remove anchor alarm, deviation alarm make navigation easier;
功能强大：500个航点、20条航线、移锚报警、偏航报警等让航海更轻松；
Powerful: 500 destinations, 20 routes, remove anchor alarm, deviation alarm make navigation easier;
功能强大：500个航点、20条航线、移锚报警、偏航报警等让航海更轻松；
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