BT747 is Software for GPS Data Logger Devices

  • Download recorded GPS Tracks
  • Workaround for GPS Week Number Rollover Bug
  • Compatible with most GPS Data Loggers or Tracking Devices using the MTK chipset.
  • Convert GPS position data in many formats (HTML (Google Maps API), GPX, KML, KMZ, ...)
  • Geotag JPG pictures and position any other filetype on the map (voice, documents, ...)
  • Handheld Devices (Palm, WinCE, Mobile Phones supporting Java (J2ME)) support
  • Desktops (Windows, MacOSX, Linux flavors) support
  • Configure MTK Chipset Based Devices and GPS Loggers
  • Real Time Tracking as explained  in GPS Tracking
  • AGPS(EPO) data upload to MTK II Chipset Based Devices and GPS Loggers (2.X version).
  • Bluetooth support (within some limitations)
  • Upload to OpenStreetMap directly for fast access to your tracks while mapping

Install BT747 GPS Data Logger Software or get a zip file (including source code). 


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GPS Week Number Rollover Bug - Workaround for GLOG 760 (and others)

The Transystem GLOG 760 Logger is affected by the GPS Week Rollover Bug for recordings in memory.  The values read in real time from the virtual serial port over USB are correct.

As a result BT747 was reporting no recordings in the log file as the reported date was in 1999 for recent recordings.

This was changed in BT747 V2.2.1 .  This version accepts dates starting from 1980 and - more importantly - it adds 1024 weeks to any date before 1/1/2009.


mdeweerd's picture

New AGPS URL

Sun, 08/05/2018 - 03:26 — mdeweerd

A new version of BT747 was released integrating a new AGPS download location.

The application has also been signed with a new signature, https://soft.bt747.org has been updated with these signatures and the jnlp files have been updated to use https.


mdeweerd's picture

BT747 - New code signatures

Sat, 02/13/2016 - 15:41 — mdeweerd

The code signing key used for BT747 had to be upgraded to SHA-256.

Unfortunately that also revoked the old key and apparently the timestamping was not properly done with the previous signatures.  So the java laucher complains that the certificate is revoked.

All files have been resigned and republished.

You may need to launch:

javaws -viewer

[on windows : "Windows Key + R" to access the execute popup where you can enter this].


Installing the Desktop Version of "MTK Data Logger Control BT747"

IMPORTANT: BT747 is updated with a CERTIFICATE to comply with JAVA 7 (1.7.0_51) security.
(I bought a trusted certificate (provided by a trusted authority) for about $300.  Received it on Jan. 17, 2014.
Thank you (!) to the users that donated a bit (thanks!) to partially cover the cost of the certificate.
 If every person using BT747 would donate $1 the cost would be covered in about two weeks (luckyly for you, I did not wait to cover the cost).

Installing the desktop version of BT747 for GPS control is fairly easy through the 'Java Web Start' system.  This system works on Windows flavours, MacOS and Linux.

To download zip files follow this link.

On Ubuntu it is recommended to Install sun-java6 first

For easy installation (RECOMMENDED!), use one of these links:
Try the desktop version of BT747 or Install the desktop version of BT747
Try the development version, Install the current development version or keep it up to date automatically.

On recent machines or in case of trouble with the serial link: BT747 Latest using RxTx 2.2pre2 (RxTx dev version) for Windows 32 & 64 bit, MacOSX, Linux or Install the development version using RXTX2.2pre or Install the stable version using RXTX2.2pre


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