Reddit reviews Scuba Choice Scuba Diving Deluxe Wrist Compass

What do you mean "standard military watches"?
The official standard military watch is the MIL-W-46374 which does not now, nor has it ever had a compass.

Now, you can buy a wrist-mounted compass for pretty cheap like this dive compass, but again, as someone that's used those (certified PADI and NAUI diver for 13 years), you can get a general bearing on them because they're designed for high visibility (vis gets really shitty in some waters) but you're not going to quickly (within a second like the original guy I responded to was talking about) get a precise bearing off of them.

I get that compasses would be a good thing in Tarkov. Hell, I've wished for them plenty of times myself... but the way the guy I originally responded to was talking about, isn't going to be a thing. We're not going to get some instant-bearing compass wheel like in PUBG. The last confirmation from Nikita was that we're going to get a physical compass we have to pull out and use. Until that changes, or someone else from BSG comes in and says, "Hey, we're putting in a HUD/UI compass," talking about using a compass for making callouts in the middle of a firefight is a dream. If you want to say, "The southside door," you learn which side is the south beforehand so you're not grabbing for a compass while you're getting shot at.
https://www.reddit.com/r/EscapefromTarkov/comments/8zvrrj/compass_you_never_lose_just_like_player/e2m9sdw?utm_source=share&utm_medium=web2x