757 Turning Off Course

I am on course to Dublin right now and all of a sudden my 757 turns off course. How do I fix this and what is going on.

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Are you tuned to the GPS, Nav 1, or Nav 2? If GPS, which leg of your flight plan is activated right now?

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Is your source in the GPS mode in the nav section?

i had it on nav 1

You’ll want it tuned to the GPS if your intention is to follow your flight plan.

ok thanks it worked

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That happened to me as well, I was flying A330 heading Moscow… just got my eyes out of the devices and suddenly, it was off course… weird… but it only happened to me once…

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