private static Integer getSlotOffset(AisExtractor extractor,
			int slotTimeout, int startIndex) {
		if (slotTimeout == 0)
			return extractor.getValue(startIndex + 5, startIndex + 19);
		else
			return null;
	}
private static Integer getSlotOffset ( AisExtractor extractor , int slotTimeout , int startIndex ) { if ( slotTimeout == 0 ) return extractor . getValue ( startIndex + 5 , startIndex + 19 ) ; else return null ; }
Returns slot offset as per 1371-4.pdf.

@param extractor
@param slotTimeout
@param startIndex
@return