That Mariner Reference Number

Social Security Numbers used to have a rhyme and reason, which turned out to be a downside. With somebody’s hometown and date of birth, a hacker had a reasonable chance of guessing a social security number. Since 2011, new numbers issued to infants and immigrants have been randomized. The US Coast Guard likewise uses Mariner Reference Numbers, which for the longest time were issued in sequential order. So, you could take a look at the ship’s license rack, outside the Captain’s office, and determine who the real old salts were. For Maritime Academy students, Mariner Reference Numbers are usually issued before interning on a commercial or government ship, either freshman or sophomore year, depending on the school. Thus, a class year would have Mariner Reference Numbers grouped in close proximity. There are exceptions, for example, students who got their start as commercial fishermen or deep-sea deckhands. Those experienced mariners near retirement today have numbers in the vicinity of 2500000. Members of the Class of 2020 have numbers around 4500000. It’s certainly doubtful that the US Coast Guard has issued credentials to 2.5 million citizens and lawful residents, but there was a certain order to the numbering. After that, all bets are off. I’ve seen Mariner Reference Numbers in the 8000000’s, for example. It's certainly the end of a longstanding era. Before the Merchant Marine Act of 1936, the US Coast Guard issued entry-level credentials to many people who never had an intent of working at sea. It was a good way to get a no-cost photo ID during a time when not all states required driver’s licenses, and car ownership was far from universal. The “Z-Cards” of the World War Two era bore a six-digit number. Many were issued to the crews of thousands of Liberty and Victory ships, and were replaced free-of-charge if lost in a maritime casualty (this provision still stands, though fortunately few credentials are lost in shipwreck today). Mariner Reference Numbers crept upward at varying paces, depending on the tides of war and economic fortune. Now, they bounce by leaps and bounds.