If you write those coordinates down and search for them on Google Maps, you'll find that they correspond to your in-game location in the real world. For example, one level is set in Singapore, so your Tac Insert's coordinates will show a place in Singapore. The detail is simultaneously so mind-bogglingly precise and utterly pointless that it's almost beautiful.
But this series is full of "nobody will ever notice this" details -- in one level of Call of Duty: Modern Warfare 3, you're trapped in a plane that is falling from the sky. If you happen to press the reload button during this brief sequence, your magazine will actually float away from you like it would in real life.
Luckily, pants prevent the same thing from happening when you s**t yourself.
In Call of Duty: Black Ops and its 1980s-movie-sequel-titled follow-up, Black Ops II, there is a multiplayer level called Nuketown that is crammed full of hidden details. For instance, there is a scale model of the Brady Bunch house, despite the fact that 90 percent of the game's audience isn't even old enough to tell you the names of all five original Power Rangers.
"Here's a story ... of a lovely lady ... who was bringing up thr- INCOMING! HIT THE FUCKING DECK!"