code: public void addGSA( GSASentence gsa ) {
          try {
              if (gsa.isValid()) {
                  gpsFixStatus = gsa.getFixStatus();
                  horizontalPrecision = gsa.getHorizontalDOP();
                  verticalPrecision = gsa.getVerticalDOP();
                  positionPrecision = gsa.getPositionDOP();
                  satelliteIds = gsa.getSatelliteIds();
              }
          } catch (Exception e) {
              // ignore it, this should be handled in the isValid,
              // if an exception is thrown, we can't deal with it here.
          }
      }
docs: Method to add a new {@link GSASentence}.
  
  @param gsa the sentence to add.