code: public void addGSV( GSVSentence gsv ) {
          try {
              if (gsv.isValid())
                  satelliteInfo = gsv.getSatelliteInfo();
          } 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 GSVSentence}.
  
  @param gsv the sentence to add.