As the history somehow shows everything as changed, here is what I changed:

g.fillRect(0,0,230,40);

if (isNaN(m.heading)) { g.setFontAlign(-1,-1); g.setFont("6x8",2); g.drawString("Uncalibrated",50,12); g.drawString("turn 360° around",25,26); } else { g.setFontAlign(0,0); g.setFont("6x8",3); g.drawString(Math.round(m.heading),120,12); }

Neat, thanks! I guess maybe line endings got changed somehow.