code: function (screenOffset, imagePath) {
  
              var sOffset = screenOffset ? screenOffset
                  : new Offset(WorldWind.OFFSET_FRACTION, 1, WorldWind.OFFSET_FRACTION, 1), // upper-right placement
                  iPath = imagePath ? imagePath : WorldWind.configuration.baseUrl + "images/notched-compass.png";
  
              ScreenImage.call(this, sOffset, iPath);
  
              // Must set the default image offset after calling the constructor above.
  
              if (!screenOffset) {
                  // Align the upper right corner of the image with the screen point, and give the image some padding.
                  this.imageOffset = new Offset(WorldWind.OFFSET_FRACTION, 1.1, WorldWind.OFFSET_FRACTION, 1.1);
              }
  
              /**
               * Specifies the size of the compass as a fraction of the WorldWindow width.
               * @type {number}
               * @default 0.15
               */
              this.size = 0.15;
          }
docs: Constructs a compass.
  @alias Compass
  @constructor
  @augments ScreenImage
  @classdesc Displays a compass image at a specified location in the WorldWindow. The compass image rotates
  and tilts to reflect the current navigator's heading and tilt.
  @param {Offset} screenOffset The offset indicating the image's placement on the screen. If null or undefined
  the compass is placed at the upper-right corner of the WorldWindow.
  Use [the image offset property]{@link ScreenImage#imageOffset} to position the image relative to the
  screen point.
  @param {String} imagePath The URL of the image to display. If null or undefined, a default compass image is used.