using GPSBabel-GUI-2 i had the chance to read from a device like MTK Logger iBlue 747+.   The port usb com 8 was found and the tranfer of data was fine.
result:  gpsbabel.exe -p "" -t -i mtk -f com8: -o gpx -F "I:\projekte\gps\mtk\gpx\2009-09-11.gpx"
using the beta-version beta20091003 i have only the opportunity to select between com 1, 2, 3 und 4
therefore i got the error -code:
gpsbabel -D3 -t -i mtk -f com1: -o gpx -F I:/projekte/gps/mtk/gpx/2009-10.gpx

GPSBabel Version: 1.3.7-beta20091003

Opening port com1:...

Verifying MTK based device...

NMEA command '$PMTK605*31

' timeout !

options: module/option=value: mtk/erase="0" (=default)

options: module/option=value: mtk/erase_only="0" (=default)

options: module/option=value: mtk/log_enable="0" (=default)

Translated port name: "com1:"

mtk_logger: This is not a MTK based GPS ! (or is device turned off ?)


system requirements:

Microsoft® Windows Vista™ Ultimate
Version 6.0.6002 Service Pack 2 Build 6002 (64bit)

8 active USB-Ports


is there a usb-lib missing?

I hope this information will be useful.



additional a note about http://www.gpsbabel.org/capabilities.shtml


MTK Logger (iBlue 747+) download mtk  waypoints read : yes;    tracks read: yes





Norbert Marquardt