Looking for 3DR Compass/GRP Module alternative

Good day everyone,

I have a 3DR kit and I put together a quadcopter more than a year ago but last time I flew it I was having issues with it, the quadcopter was flying fine but when switching to LAND or RTL modes, it was acting all crazy and finally crashing, I was told by 3DR that my compass module was bad and needed to be replace, the question is why it flies fine and only acts crazy on LAND or RTL modes. I am out of luck now because 3DR doesn't sell the compass/GPS modules anymore, does anyone know where to get them?

Thank you in advance.

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