inputs.text: excellent reliable gps - using holux gr213u usb gps receiver past two yearsi found excellent production quality made taiwan truly durable waterproof stated convenient strong magnet embedded base allows adhere iron steel surfacefrom technical point view contains bulletproof sirfstar iii chipset specifically designed receiving us constellation gps satellite signals one best chipsets business no russian glonass chinese gps support chipset later models based different chipset supports us russian satellites however unit works greatdriver software supplied emulates serial port allowing compatibility huge range gps softwareit also supports industry standard nmea national marine electronics association command set programming additional functions invoked including zda 1 pulse per second time signal also makes useful many purposes including serving accurate time source many applications requiring time sync including amateur radio jt65 wspr usethe package comes attractively boxed software mini cd rom adequate instructions plus velcro suction cap anchor lead application found driver compatible many 3rd party gps programs supporting nmea protocolled flashes sync achieved usually 10 seconds connecting computerit everything expect usb powered gps unit