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allow negative heading in maths
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@ -344,11 +344,13 @@ adsb_vel decode_frame_velo(ADSBFrame& frame){
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if((frame_data[7]&0x80) >> 7) velo_ns *= -1; //check ns direction sign
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velo.speed = sqrt(velo_ns*velo_ns + velo_ew*velo_ew);
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if(velo.speed){
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//calculate heading in degrees from ew/ns velocities
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velo.heading = (uint16_t)(atan2(velo_ew,velo_ns) * 180.0 / pi);
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int16_t heading_temp = (int16_t)(atan2(velo_ew,velo_ns) * 180.0 / pi);
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// We don't want negative values but a 0-360 scale.
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if (velo.heading < 0) velo.heading += 360.0;
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if (heading_temp < 0) heading_temp += 360.0;
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velo.heading = (uint16_t)heading_temp;
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}
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}else if(velo_type == 3 || velo_type == 4){ //Airspeed
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