- Can't recognize my logger file format. Logger BTGP-38KM

Says "It's possible that it is a valid file format (such as KML) that doesn't contain any timestamped data", but i know timestamps are in it.
It's can be non-standard binary data. Sample file: http://ubuntuone.com/p/Y5X/ (.dat, and same track in kml format: http://ubuntuone.com/p/Y5Y/)

Author: Юрий Чудновский, 13.01.2011, 07:04
Idea status: under consideration


tompaton, 14.01.2011, 00:26
The binary file you provided doesn't appear to be supported by GPSBabel, which is the underlying technology used by GPSLogLabs to parse log files. See http://www.gpsbabel.org/htmldoc-1.4.2/The_Formats.html for a list of formats and devices it currently supports.

Searching on the web I was unable to find details of which chipset the BTGP-38KM uses, and reverse engineering the file format is something you'd have to approach the GPSBabel developers about: http://sourceforge.net/mailarchive/forum.php?forum_name=gpsbabel-misc

Unfortunately, the KML file doesn't include enough data to be used either. It contains a list of latitude and longitude pairs with no time information (in the section) and only timestamps for the start and finish markers (in the tags). It may be possible to convert that to a CSV file which can be uploaded, but that is something that would vary for every user (e.g. the time between each logged point may be different) and you would have to look into doing that yourself.

Hopefully your logger software supports exporting to another format, such as GPX, which you can use.
Ben Law, 09.08.2011, 15:27
BTGP-38KM uses the SiRF-III Chipset

Description :

BTGP-38KM, a high-tech product combines the advanced Bluetooth technology and GPS technology. Through, Bluetooth technology, you can receive and storage GPS data through intelligent mobile phone, PDA, laptop and desktop. Can be used for location、navigation、read the history of track records, and other applications.


65 Channels GPS + 38400bps baud Bluetooth transmission + Data Logger.
Compliant with Bluetooth specification V2.0 (Class 2).
Support Bluetooth serial communication Profile (SPP Profile).
Support the baud rate 9600/38400bps in NMEA-0183 standard.
Integrated Bluetooth GPS receiver function and GPS data recording function, a dual-use handle device.
8M Bytes flash memory for data logging with that stores up to 300 hours’ data records.
Charger circuitry and battery socket for NOKIA Li-ION battery (820mA, charger of NOKIA mobile, e.g.N70), About 18.5 hours of operation.
In actual use, can automatically shut down Bluetooth to save the power function.
Capable of keeping up to 90000 records position, including longitude, latitude, and speed, UTC, tag data.
The location histories of 38KM can be used incidental application software GPS Track Tagger, pass the internet, are read on the Google Map.
Small-size, humanized design, portable, cute appearance.
The product has passed CE, FCC, ROHS certification


Bluetooth code V2.0+EDR, mission power Class 2 (4dBm max),Receiving sensibility -80dBm
Bluetooth communication distance 10m typical (free space)
Working current about 60mA average
Working voltage 3.7V~4.2V
Chargeable voltage 5.5V
Recharge time 2.5hrs typical
Working time about 18.5hr, track after the charging is full
Working temperature -40℃ to +85℃
Storage temperature -40℃ to +150℃
Dimension: 72.8(L) x45.8 (W) x18.8 (H) mm.
Weight: 70g.

General Index

Receivable frequency L1, 1575.42MHz
C/A code 1.023MHz
Channel 65


Search -151dBm
Track -160dBm


Location 7m CEP 90%,3m CEP 50%(SA OFF)
Velocity 0.1m/s

Location Time

Hot startup 1s, average
Warm startup 35s, average
Cold startup 40s, average

Dynamic Condition

Altitude Max 10 km
Horizontal speed Max 515m/s
Acceleration Max 4g

GPS Protocol

NMEA-0183 ASIC protocol
Default NMEA GGA, GSA, GSV and RMC, (VTG, GLL and RMS optional)
9600bps baud rate, 8 data bits, 1 stop bit, no check bit
Tamas, 15.01.2012, 09:50

I think I have the same logger! I still couldn't find out its native format, however, www.gpsvisualizer.com converts it to .kml flawlessly (it even retains elevation data!)


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