Interferes with the GPS signal at Samsung Galaxy W

I bought the cable for the car because it is easy to hide through the thin cable and the reel nicely stowed. The 90 ° angle on the plug seemed well located. The shop also works together with a USB adapter for the cigarette lighter. But the cable interferes somehow the GPS signal, killer criterion, because I want to use the phone (SGW) as Navi. With all other cables that I've tried, the signal is OK, also without charge. Therefore not suitable for my purpose.

Update:
After the review, I received a call from HandyNow that it is the problem described handle a product defect and I get a new cable immediately. Unfortunately, even with the new cable the same problem, the GPS signal strength took directly after plugging off significantly and the satellite fix has been lost (tested with Samsung Galaxy W and the app GPS Test). Transferred So for me, unfortunately, nothing for the car, for charging and data taugts but. But kudos to the dealer HandyNow for customer service!

Update 2:
New phone, new luck. In my new HTC Desire X, the GPS signal is not disturbed, everything works as it should. Therefore now 4 instead of 2 stars.