Mid slot
Mid slots are a category of module slot found on ships in EVE. Generally, mid slots contain activatable modules that may assist in tackling, propulsion, or generally improve the ships behavior. Shield tanking modules occupy mid slots. Some mid slot modules share purposes with low slots, but the details of their use differ.
This page is a collection of all the types of modules that use mid slots.
Capacitor
These modules will restore capacitor energy. Boosters are generally preferred for large ships in PvP in the event of capacitor neutralizing. For your exact needs, experimenting a fitting tool will show which will serve you best.
Capacitor Batteries
These modules will increase your total capacitor (and subsequently capacitor regen, as total capacitor and capacitor regen time are independent).
Capacitor Boosters
These modules will replenish your capacitor while expending a charge that you must carry (like ammo).
Capacitor Rechargers
These modules will increase your capacitor recharge time with no penalty.
Damage application supplements
These modules will increase the ability to damage ships, though not necessarily the amount of damage dealt.
Tracking Computers
These modules will increase your optimal range, falloff range, and tracking speed.
Tracking Links
These modules will increase an allied ship's optimal range, falloff range, and tracking speed.
Drone Upgrades
These modules will increase the speed and tracking of drones.
Omnidirectional Tracking Links
These modules increase the optimal range and tracking of your drones.
These modules increase the MicroWarpDrive speed of your drones(their speed when they are flying around, not when they are orbiting & attacking).
EWAR
These modules can mess with enemy ships ability to damage you, or increase the ability of your own ships to damage them.
ECM
These modules will make it difficult for an enemy ship to lock targets. They come in five varieties to coincide with the four sensor types and a multispectral.
ECM Bursts
This is essentially the same as ECM but affects all targets in a given radius.
ECCM
These modules protect against ECM.
ECCM, Projected
These modules protect ships that you use this module on, against ECM.
Remote Sensor Boosters
These modules increase the targeted ship's sensor range and locking speed.
Remote Sensor Dampeners
These modules decrease the targeted ship's sensor range and locking speed.
Sensor Boosters
These modules increase your sensor range and locking speed.
Target Painters
These modules increase the signature radius of enemy ships, increasing the damage they incur when hit.
Tracking Disruptors
These modules decrease the tracking speed of enemy turrets.
Propulsion
These modules will increase a ship's velocity.
Afterburners
These modules will increase your velocity by roughly 120% while using some capacitor.
Microwarpdrives
These modules will increase your velocity by 500% while increasing your signature radius by 500% and a significant use of capacitor.
Micro Jump Drives
These modules have a spool up time and instantly teleport a ship 100km in the direction the nose is facing. As of the Kronos expansion these modules now come in both Large (battleship) and Medium (battlecruiser) varieties.
Shield tanking
These modules will restore, extend, or increase the resistance of your shields. Finding a proper balance between shield extenders, shield hardeners, and shield rechargers is essential for a passive shield tank.
Shield Boosters
These modules will repair your shields. Boost amplifiers are also in this category and they serve to increase the amount of shield repaired by a shield booster. You generally don't want to fit more than a single booster, as the cap drain will be quite high. Instead use a size-appropriate (or oversized) shield booster matched with a shield boost amplifier.
Anciliary Shield Boosters
These modules will repair your shields, and use cap charges as ammo. When not loaded with cap charges, they can also run from your capacitor, but require more cap than a normal shield booster.
Shield Boost Amplifiers
These modules increase the amount of shield provided by shield boosters per cycle.
Shield Extenders
These modules will increase your total shield amount while increasing your signature radius (consequently increasing damage application against your ship). Shield extenders are great for increasing a passive tank (remember that total shield and time to recharge are independent, so as you increase total shields you increase shield regeneration rate) but can work against you if they increase your signature radius too much.
Shield Hardeners
These modules will increase your shield resistances while using a small amount of capacitor. Shield hardeners are strongly preferred to shield resistance amplifiers as the resistance increase is much greater and the capacitor drain is minor.
Shield Rechargers
These modules will increase your shield regeneration without penalty.
Shield Resistance Amplifiers
These modules will increase your shield resistances and uses no capacitor.
Tackling
These modules will slow and prevent warping of enemy ships.
Stasis Webifiers
These modules will decrease an enemy ship's velocity.
Warp Jammers
These modules will prevent an enemy ship from warping (provided they do not have warp stabilizers to negate your jamming). Warp Scramblers have a base range of 7.5km, have a jamming strength of two and will also disable the microwarp drives of your target as long as the target is scrambled. Warp Disruptors have a base range of 20km, jamming strength of one, and use more capacitor than warp scramblers.
Misc
These modules did not fit into the above categories.
Command Processor
The command processor allows for one extra warfare link module to be fitted on a ship.
Hull Repair Systems
These modules will repair your structure. They cycle much slower than shield or armor repairers, and restore less, making them ineffective to use in battle.
Passive Targeting Systems
These modules will allow you to target a ship without them knowing. Passive targeting systems matched with ship scanners can be a great way to have an alt find the fittings of war targets.
Scanners
These modules will allow you to scan the composition of asteroids, ice belts, and gas clouds, as well as ship fittings and cargo. Data Analyzers and Relic Analyzers are used to extract stuff from special containers in Data and Relic sites, respectively.
