hdg:  document.getElementById('conn-hdg'),
      battv:document.getElementById('conn-battv'),
      battp:document.getElementById('conn-battpct'),
      mode: document.getElementById('conn-mode'),
      gps:  document.getElementById('conn-gps'),
      ll:   document.getElementById('latlon-val'),
    };

    function showToast(text, ok=false) {
      toast.textContent = text;
      toast.style.background = ok ? 'rgba(20,120,40,0.85)' : 'rgba(0,0,0,0.65)';
      toast.hidden = false;
      clearTimeout(showTo