To configure NMEATime2 (by VisualGPS) for precise GPS time synchronization on a Windows PC, you must properly link your hardware receiver to the software and optimize your communication settings.
NMEA data tells the computer which second it is, while an optional Pulse Per Second (PPS) hardware line tells the computer exactly when that second starts. Configuring NMEATime2 correctly allows your PC to achieve high-precision synchronization even when completely disconnected from the internet. Step 1: Identify Your Hardware COM Port
Your GPS receiver must be connected to your PC via a USB cable or a physical RS-232 serial DB9 port. Press Windows Key + X and select Device Manager. Expand the Ports (COM & LPT) section.
Look for your GPS device (e.g., Prolific USB-to-Serial Comm Port or u-blox Virtual COM Port) and note the assigned port number (e.g., COM3). Step 2: Configure the GPS Settings in NMEATime2
Open the NMEATime2 user interface. If it is running in the background, click the ^ icon in your Windows system tray, right-click the NMEATime2 icon, and select Setup. Navigate to the GPS tab or section.
Set the Serial Port to match the COM port you identified in Device Manager.
Set the Baud Rate. Most standard GPS receivers stream at 4800 or 9600 bps, though modern high-speed units might use 38400 or 115200. Check your receiver’s manual if you are unsure.
Step 3: Enable Pulse Per Second (PPS) for Microsecond Accuracy
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