sat-nav

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++sat-nav, Sat-Nav /ˈsæt næv/ noun [uncountable] informal  (satellite navigation) a piece of electronic equipment in a car. It can tell you which way you need to go by using information received from a satellite （车载）卫星导航设备，卫星导航系统 The Audi A6 comes with sat-nav and climate control as standard. 奥迪A6车型的标准配置有卫星导航设备和空调系统。

sat-nav nounChinese  

sat-nav
sat-nav /ˈsæt næv/ noun [uncountable] informal
a piece of electronic equipment in a car. It can tell you which way you need to go by using information received from a satellite:
    The Audi A6 comes with sat-nav and climate control as standard.