visad/src/main/java/ucar/nc2/iosp/gempak/GempakStationFileIOSP.java
@Override
  public boolean isValidFile(RandomAccessFile raf) throws IOException {
    try {
      gemreader = makeStationReader();
      return gemreader.init(raf, false);
    } catch (Exception ioe) {
      return false;
    }
  }
@Override
  public boolean isValidFile(RandomAccessFile raf) throws IOException {
    try {
      gemreader = makeStationReader();
      return gemreader.init(raf, false);
    } catch (Exception ioe) {
      return false;
    }
  }
Is this a valid file?

@param raf RandomAccessFile to check
@return true if a valid Gempak grid file
@throws IOException problem reading file