Tango GPS shows GPS Times form 1999

[Matthias Camenzind]

I've installed Debian on microSD 2GB with Xfce, tangogps and fso-gpsd.
The "Trip" section is normaly showing a GPS Time from 1999-11-30 00:00:00 somtimes GPS Time changes short to 2006 or 2007. Tangogps on Om2008.8 shows 1970. On both 0/0 Satellites HDOP 0.0.
Is there something wrong with my GPS device?
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