by cold start u mean time to get valid NMEA strings? earlier i didn't had u.fl connector so i used to connect antenna with alligator clips, so i noticed it took 20 minutes to get a fix, but now using u.fl i get fix within a minute...
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i downloaded the software but on starting it i get "no communication port found" error. i am using usb to rs232, i think the software is not able to recognize usb rs232. i tried changes the port but still i get the same error.