code: private static Integer getMinuteUtc(AisExtractor extractor,
  			int slotTimeout, int startIndex) {
  		if (slotTimeout == 1) {
  			// skip the msb bit
  			int minutes = extractor.getValue(startIndex + 10, startIndex + 17);
  			return minutes;
  		} else
  			return null;
  	}
docs: Returns minute UTC as per 1371-4.pdf.
  
  @param extractor
  @param slotTimeout
  @param startIndex
  @return