New York. Reykjavik. Paris. Titanic. Flipping channels to view the flight map on your seatback screen offers a refresher on the world’s capitals and, oddly, a double-take at shipwrecks plotted across oceans on the same map.

Travelers have Rockwell Collins to thank for the dark history lesson; the Iowa-based conglomerate has its hands in everything from airplane seat design to biometric security solutions , but one of its many divisions specializes in making in-flight entertainment systems for commercial and private aviation. Its clients include British Airways, China Eastern, American Airlines, and Ethiopian Airlines, among others. The popularity of Rockwell Collins systems, which encompass everything from the seatback touchscreen monitor to some of the programming you watch on your flight, means potentially tens of thousands of passengers every day are flipping over to check their flight’s progress—and getting a bonus lesson on the locations of historic shipwrecks like the Canadian Empress of Ireland, the Civil War-era Monitor, the Andrea Doria, which sunk near the coast of Nantucket, and, of course, the Titanic. Even Redditors have wondered what’s up with this.

There’s no morbid reason for it, really. It’s simply an educational bonus for when boredom can set it.

"When traveling over the ocean, there are often large portions of the flight where only water is visible," shares Clint Pine, programs manager for Airshow at Rockwell Collins. " Rockwell Collins Airshow includes shipwrecks and other undersea items so that passengers can be informed about items that they are flying over but cannot visually see."

A few of those other undersea items include the Bermuda Rise, a cluster of extinct volcanoes; and the Hudson Canyon, the Ice Age-era mouth of New York’s Hudson River . Pine notes to Condé Nast Traveler that this extra info was introduced in 2004, and hints that additional dots of the maps are on the way, saying, "In addition to traditional points of interest for items like landmarks and cities, we are looking to add expanded geological content so that passengers know exactly what they are seeing as they look out the window."

In fact, the newest versions of Airshow installed on airplanes are already moving away from showing shipwrecks . If you're stuck staring at an older map complete with these pieces of history, however, resist the temptation to ponder the tragedies and instead consider how far modern transportation has come over the centuries, and that travelers no longer require undertaking lengthy, dangerous journeys by sea in order to reach their destinations. The shipwreck and seamount marks on in-flight maps are there to educate and entertain. So there’s no need to worry since, as one Reddit commenter put it, “as long as you don't see them out your window, you're good.”