HUD | Weapon attachments Battlefield Hardline Guide

As a matter of fact, there only are two important instruments in the cockpit. One of them is the countering system status in the upper-left corner. "READY" means that the system is ready to be used, whereas "WAIT" means that it is being reloaded. Underneath this status, you can also see the time remaining, until the system is reloaded.

The other important instrument is the altimeter on the right. It is especially useful, while flying backwards.