There are a few tips for fitting out the most commonly used scanning ship in game
Rigging Your Ship - There is no perfect way to fit a ship for scanning Knight online Gold, but there are a few tips for fitting out the most commonly used scanning ship - the Covert Ops Frigate. Since you don't need any guns, your high slots can be used to fit a cloak and probe launcher.
If you intend to tackle your target rather than calling in backup on top of him, a warp scrambler to hold him and sensor dampners to deny him a lock until support arrives would be good to fit in your mid slots.
Remaining mid slots are best fitted with a capacitor battery to enable you to run your scrambler and dampeners for longer, and to make the 100 AU or greater warps over those really large systems.
For your low slots, Nan fibers are recommended. They give the best compromise between speed and agility, both of which are very important to a Covert Ops ship. Additionally, if you don't have Covert Ops level 5, you might need a co-processor in one of your low slots to fit everything.
If you're lucky enough to have access to rigs, use either Auxiliary Thrusters for ship speed or Gravity Capacitor Upgrades for scan speed.