Mentor

Provides additional experience to all crew members except the Commander.

1% skill: Each crew member, except commander, receive +0.1% to earned experience
100% skill: Each crew member, except commander, receive +10% to earned experience

Eagle Eye

Enables the Commander to identify critically damaged modules on targeted vehicles within the view range.

Is effective both in indirect and direct fire modes.

100% skill: Starts at 4 seconds after continuously targeting enemy

Jack of All Trades

Enables the Commander to master every qualification and replace knocked-out crew members.

Only major qualifications can be substituted. The replacement effect diminishes with each crew member knocked out.

1% skill: -0.5% skill level of knocked-out crew member
100% skill: -50% skill level of knocked-out crew member

Sixth Sense

Enables the Commander to identify whether the vehicle has been spotted by the enemy.

100% skill: Info about spotting your tank by enemy starts with delay of 3 seconds

Recon

Increases Maximum View Range.

The skill is more effective if observation devices are damaged, or when combined with Situational Awareness, Coated Optics, Experimental Optics, Bounty Optics, Binocular Telescope, and Optical Calibration.

1% skill: +0.02% view range with undamaged observation device and +0.2% view range with damaged observation device
100% skill: +2% view range with undamaged observation device and +20% view range with damaged observation device