i have an 06 IS and my navigation has always worked fine. in the last 3 months it gets lost every day and i have to recalibrate it. anyone know what to do or how to fix it?

 

The original map disc that came with the '06 cars during most of the model year had a software bug that hampered its ability to lock onto the satellites.

Lexus TSIB EL013-06 will replace that disc with one that has updated software without the bug, or you could just buy a newer map disc.