There is a very handy mod that has these features:

• Timers for active potion effects
• Arrow counter
• Visual Clock
• Armor Status
• Location ( X and Z )
• Compass ( Displaying the diriction your facing )
• Thirst Notifier

So as you can see, it's a very handy mod you should install.

And the ADMINS are okay with this mod.

Link: http://www.reddit.com/r/MineZ/comments/xjaaw/minez_tactical_hud_mod/

PS: I'm not the maker of this mod!