Correct bearing:          Elevated bearing:
0/360                     180
90                        90
180                       0/360
270                       270

if(numCurrentZAcc > 0){
    if(numCurrentZAcc >= Math.abs(numCurrentXAcc)){
        numCompass = 180 - numCompass;
        if (numCompass < 0){
            numCompass = numCompass + 360;
        }
    }
}