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 GPS Programming
 "Beta" GPS software
 Amod Nmea & Royaltek - Jdatalog utility - 1.2.2

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T O P I C    R E V I E W
denti13 Posted - 01 févr. 2008 : 10:18:12
Hello All,

Yet another soft to convert log coming from nmea file (coming from Amod 3080 for example), Royaltek rbt-3000 log file or rbt-2300/rgm-3800 serial connection.

Work on Windows/Linux/Mac OSX (have to installe prolific drivers for rgm-3800 :

Need Sun java 1.5 minimum.

Linux and Mac user, check infos in the Readme file.

Automatic geoid correction (coordinates come with MSL alti from Royaltek GPS datalogger), from Egm96 grid (all the world) or raf98 (for french coordinates).

Averaging position option. Sample, yellow without averaging, violet with averaging.

PCX, csv, gpx, kml (Google Earth) and Dxf export (add average position and duration. Only in Lambert IIe yet, other system on demand).

Windows version (with installer) :
Mac/Linux/Windows (use datalog.bat on windows or on other OS):

Windows version (with installer) :
Mac/Linux/Windows (use datalog.bat on windows or on other OS):


WARNING : 1) this a beta version. Only tested in France. If you have a pb thanks to send me an NMEA sample file.
2) Seems to be an issue between Rxtx Serial Java Module and some bluetooth software.

Version history :
- b5 (try to) fix alti correction pb when we have W longitude (Thank's Maximal).
- b6 improve reactivity
correct minor bug in average feature
try to fix the Linux connection pb
Add gpx and kml export
Optimize averaging feature
Add nb satellites filter
Add GPS settings modification possibility
Display current GPS settings when connect
Start retreiving gps logs when click on connect button
Some GUI modifs
Correct missing class (javax.swing.GroupLayout) pb on mac
Try fo fix pb with West longitude (thank's to give me feedback)
Fix display pb when use hgt (Nasa) elevation
Fix gpx export issue (gpx now compatible with sportrack)
Allow full infos (lat,lon,alt,vel,hdop,pdop,sat, ...) logs available on RGM3800 with latest firmware.
Fix a regression concerning people using java 1.5 and Macintosh users (swing-layout class pb).

Automatic GPS version detection (RBT2300or RGM3800)
Firmware version detection. Starting firmware version on RGM3800, geoide correction is no more needed (I don't know for RBT2300).
Settings backup.
Ozi track format import added.
Starting 1.5 (both for RBT2300 and RGM3800) geoide correction is desactivate.
Cvs export bug correction.

Add command line possibility (see Readme_CommandLine.txt).
datalog.bat --help (or --help)
Correct day changment bug.
File name suggestion during export.
Choose option possibility during export
Add GPX import support
Add Join option (and change track list presentation)
Add Command line possibility
Add Join option (and change track list presentation)
Add Gpx import
Bugs correction ...

- correct a bug concerning datalogger with old firmware (1.5<).
- add elevation substitution possibility during export (smoothed elevation or hgt elevation). If you have a track without elevation download the hgt file corresponding to your track. After that you will have the possibility to save your track with hgt elevation. See Reame file in hgt directory.
- add -e option in command line mode, to choose elevation (one or several). Ex : datalog -p /dev/ttyUSB0 -l -e gps,smooth,hgt -f csv ...
- improve app startup speed.

to be continued ....

15   L A T E S T    R E P L I E S    (Newest First)
poisonborz Posted - 12 avr. 2012 : 11:27:37
I've copied the files, but JDatalog still doesn't show the port I need.
denti13 Posted - 11 avr. 2012 : 18:39:09
My suggestion is to try a newest version of rxtx (it's the java lib used for serial port managment). Try this one (Windows-x86).
Replace RXTXcomm.jar (in lib subdir) and rxtxSerial.dll/rxtxParallel.dll (in lib/win subdir).
Let me known the result.
poisonborz Posted - 11 avr. 2012 : 17:19:24
...while the above problem still exists, I just found out that the solution was right there in front of my eyes. On Royaltek's site there is a downloader available for Windows 7
poisonborz Posted - 11 avr. 2012 : 13:46:23
Originally posted by denti13

What is exactelly your pb with Jdatalog ?
Is the GUI working ?
Why did you try command line ?

Sorry for the late answer, I had a temporary solution with another log-downloader ( on WinXP but that even that ceased to work...

The problem is that it does not detect the correct port, therefore, it can't connect. This goes for both the GUI and command line version. Is there a way to force a different port?

denti13 Posted - 28 févr. 2012 : 07:42:46
What is exactelly your pb with Jdatalog ?
Is the GUI working ?
Why did you try command line ?
poisonborz Posted - 27 févr. 2012 : 22:00:25
Hi all,
I have a trusty old RBT-2300, only used it for short trips until now, with a slow record interval (~10 sec)
But now I discovered that when making longer trips with shorter intervals (resulting in files over ~2MB) the original Data Downloader crashes when downloading these files...
So I searched everywhere for an alternative data dumper, and foundthis program (I'm using Win7).
As others on different platforms mentioned, I also can't set the port I'm using (and when doing it in the command line version, it says it's not available). Is there a solution?
denti13 Posted - 20 oct. 2011 : 18:44:50
So, all is ok for you ?
If I post a new release in the future I will check the possibility to store GPS speed in gpx file.
effemmeffe Posted - 20 oct. 2011 : 16:31:13
My bad, I had some problems with the software I'm using. Now I got it and the speed is allright.
effemmeffe Posted - 14 oct. 2011 : 15:45:22
hello, denti, thanks for the quick answer.
(I think) I need the nmea format because I can't see the velocity in the gpx log I downloaded from my rbt-2300.
Today is the first day I'm playing with it and I made a fast trip with my car then I downloaded the log and no velocity is present in the gpx file.
denti13 Posted - 14 oct. 2011 : 15:28:04
Hello effemmeffe,
The internal datas are not stored in nmea format (royaltek binary format).
As there are gpx and garmin pcx output format, there is no plan to add nmea export in JDatalog.
Why do you need nmea ?

effemmeffe Posted - 14 oct. 2011 : 13:38:42
I just bought an RBT-2300 and I'm using Jdatalog to talk with it in OS X.
I have a question: can't I download the logs in NMEA format without having it converted by the software?
pemmican Posted - 09 févr. 2011 : 00:57:07
Hi, I am new to the forum and only found the first page of the thread, when seraching google and finally discovered the fix only when I was looking for where my own message was posted...

In short: works like a charm and saved my from becoming dependent on windows again.

Thanks a lot once more!

Best regards,

denti13 Posted - 04 févr. 2011 : 08:42:36
Hello pemmican,

Did you try the manip done by elou 2 post before ?

If it's does'nt work could you give the imac and OS X version you have ?


pemmican Posted - 03 févr. 2011 : 12:46:32

thanks for all your work on jdatalog!
I have tried to make it work on my Imac, but I get the following error

Merci pour tout le travail sur jdatalog et les descriptifs precis!
J'ai essaye de faire marcher jdatalog sur mon iMac pour pouvoir
recuperer les donnees de mon RBT2300 et j'ai l'erreur suivante:

Fram-2:Jdatalog cornelius_strohm$ ./
/Jdatalog/lib/mac/librxtxSerial.jnilib: no suitable image found. Did
find: /Jdatalog/lib/mac/librxtxSerial.jnilib: no matching
architecture in universal wrapper thrown while loading
Exception in thread "main" java.lang.UnsatisfiedLinkError:
/Jdatalog/lib/mac/librxtxSerial.jnilib: no suitable image found. Did
find: /Jdatalog/lib/mac/librxtxSerial.jnilib: no matching
architecture in universal wrapper
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(
at java.lang.ClassLoader.loadLibrary(
at java.lang.Runtime.loadLibrary0(
at java.lang.System.loadLibrary(
at com.SerialUtility.listAvailableSerialPorts(
at gui.LanceurJLC.main(

What do you recommend to do?
Qu'est ce que vous me conseillez de faire...?

Thank you very much in advance,
Merci d'avance,

orcad Posted - 06 août 2010 : 10:03:41

I use Jdatalog with a Royltek MBT 1100 and kinomap.
it works great but i only have a point every 3-5 second.
is it possible to have one every second?
My source file is at 5Hz
And i aslo loose speed on gpx files.
Thank you!
My file :

votre soft est le seul qui m'ai permis d'obtenir une trace exploitable par Kinomap en provenance de mon datalaooger RoyalTek MBT 1100.
Par contre je me retrouve avec un point toutes les 3 a 5 secondes (sans configurer l'average).
Le fichier source est a 5Hz et j'aurai besoin d'un fichier a 1Hz qui contienne également les vitesses des points concernés.
J'ai du passer par l'export GPX pour pouvoir utiliser Kinomap.
Mon fichier source :

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