supply of differential global positioning system department of geography , institute of science , bhu , varanasi , supply of differential global positioning system , base ( as technical specification ) , rover ( as technical specification ) , field controller ( as technical specification ) , battery ( as technical specification ) , software ( as technical specification ) , accessories ( as technical specification ) , usb data transfer cable ( as technical specification ) , connectors and cables for connecting to car batteries , suitable battery charger to rechargeable batteries from ac mains , light weight carrycase with back strapst , tripod stands ( as technical specification ) , accessories to mount rover and base on pole , , backpack for gnss receiver and rtkdevices for rover to conduct survey , bipole stand , height hook to measure height of gnss antennas and reflectors , arm or connecting antenna , extension pole/arm to increase the height of rover/base , aluminium tripod with a telescopic mast to extend the antenna height up to 5 m , whip antenna for 430-450 mhz frequency range , 5 db gain , adapter for mounting antenna , charging station for simultaneously charging 4 batteries ( compatible with provided batteries ) , external battery high output battery for set-ups over long periods , 13 v / 250 wh that can be used as ups with cable