Hi.My problem is this. Just after takeoff, about 2000-5000ft up the plane stops following the compucted SID route and turns off at some crazy angle. The FMC also says "check position," and i cannot re-engage VNAV. I am assuming that it has something to do with the IRS going out of alignment but i dont know.Can somebody plase shed some light on this issue because its driving me up the wall!Cheers for any help with this.Andy S

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