BT747 Application Tips: Optimize Performance and Data Logging

BT747 Application: Complete User Guide for Beginners

What is BT747?

BT747 is a Windows desktop application used to communicate with Bluetooth GPS receivers (typically SiRF chipset devices). It downloads and visualizes NMEA/GPS data, configures device settings, logs tracks, uploads/downloads waypoints, and performs firmware or configuration updates on supported units.

System requirements

• OS: Windows 7 or later (⁄₆₄-bit).
• Hardware: Bluetooth adapter (internal or USB dongle) or serial/USB-to-serial adapter for legacy devices.
• Disk/Memory: Minimal; a few hundred MB free.
• Drivers: Install Bluetooth stack drivers (Microsoft, Broadcom, Toshiba, or vendor-specific) and any USB-serial drivers required by your device.

Installation

1. Download the BT747 installer or ZIP from a trusted source (project page or repository).
2. Run the installer (or extract ZIP) and follow prompts. If offered, install bundled drivers.
3. Launch BT747. On first run, allow Windows to install any additional drivers if prompted.

Initial setup and connecting a GPS receiver

1. Turn on your Bluetooth GPS and enable pairing mode.
2. Pair the GPS in Windows Bluetooth settings; note the COM port assigned (for SPP/serial).
3. In BT747, open the “Port” (or “Connection”) selector and choose the assigned COM port (e.g., COM5) and appropriate baud rate (commonly 9600 or 38400).
4. Click “Open” or “Connect.” The status area should show incoming NMEA sentences or device info if successful.

Key interface areas

• Console / NMEA view: Live GPS sentences and parsed data (latitude, longitude, time, satellites).
• Map / Visualization: Plot current position and track history on an embedded map or external map provider.
• Logger / Track management: Start/stop recording, save GPX/CSV logs, and export tracks.
• Device tools: Read/write device configuration, set update rates, disable/enable NMEA sentences, and perform firmware or firmware-like updates where supported.
• Waypoints: Upload/download waypoints and manage stored points on the receiver.

Common tasks — step by step

1. Start logging a track

   • Connect to device.
   • Open “Logger” tab.
   • Click “Start logging” (choose filename and format like GPX).
   • Click “Stop logging” to finish and save.

2. Export a GPX file

   • After stopping a log, use “File → Export” or “Save as GPX.”
   • Choose filename and folder.
   • Optionally open GPX in mapping software (Google Earth, QGIS).

3. Change device update rate (fix interval)

   • Connect and open “Device configuration” or the appropriate SiRF/GPS chipset tab.
   • Locate “Position update rate” (e.g., 1 Hz, 5 Hz).
   • Set desired rate and click “Write” or “Send.”
   • Verify by observing faster NMEA sentences or updated timestamp frequency.

4. Upload/download waypoints

   • Open “Waypoints” manager.
   • Click “Download” to read device-stored waypoints.
   • Edit or add waypoints locally, then click “Upload” to send changes back to the device.

5. Backup and restore device configuration

   • Use “Read configuration” to export settings to a file.
   • Save file as backup.
   • To restore, use “Write configuration” and select the saved file.

Troubleshooting

• No connection: Verify Windows paired device and COM port; try different Bluetooth stack or adapter. Restart BT747 and the GPS device.
• Garbled NMEA data: Wrong baud rate; try common rates (4800, 9600, 38400).
• No satellites/fix: Move outdoors with a clear sky view; ensure correct antenna orientation; wait a few minutes for cold start.
• Map not showing: Check internet connection if using online maps; switch to a different map provider or use offline tiles if supported.
• Permissions/driver issues: Reinstall Bluetooth or USB-serial drivers; run BT747 as Administrator.

Tips and best practices

• Keep a local backup (.cfg/.bin) of device settings before changing anything.
• Use GPX format for maximum compatibility with mapping apps.
• For long logging sessions, ensure ample disk space and set sensible logging intervals.
• If experimenting with firmware/config commands, research device-specific commands to avoid bricking.
• When troubleshooting, try a different Bluetooth dongle or direct USB/serial connection if available.

Alternatives and complementary tools

• Mobile GPS Logger apps (Android/iOS) for on-device logging.
• GPSBabel for converting between GPS file formats.
• QGIS or Google Earth for advanced map visualization and analysis.

Quick reference table

If you want, I can write step-by-step instructions for a specific GPS model or create a printable quick-start checklist.