Clarification for external GPS+compass unit


I own the APM 2.0, the one with internal Mediatek GPS.

I bought this:

I successfully plugged the external gps by soldering the pins 2 and 3.

Now I want to use also the external compass, but the instructions are not very clear. Is it enough to cut the SDA trace on the GPS board?

I'm a bit afraid because once I cut it, there is no going back...



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