Hey Avrova1904,
The Radio Location captain skill is a good skill to run on certain ships. I say certain ships because there are ships that you need your skill points in other places. DDs are the ships that come to mind mainly for this skill. There are cases where cruisers might be taking this skill (CBs). This is a skill that gives you the direction to the closest enemy ship. Please remember that is does not give a precise location just a general direction to the nearest enemy ship. As other captains have said the ship that you are locating also gets a notice that they have been located, they just don't know by who. So you will have to plan accordingly knowing a ship on the enemy team knows a ship is using the radio location skill.
Notes:
This skill only works on ships.
This skill will not work on a captain in re-training.
Remember this skill only gives you a direction of the nearest enemy ship and this could change between multiple ships that are close.
Players that are "located" will know with an alert on their screen.
This is a good skill to use on a torpedo focused DD. You can fire "blindfire" torpedoes at a ship's location without actually seeing them. This isn't the best way to get hits but does play into the area denial style.
Use this skill mainly on DDs because other captains you might need different skills.
Hopefully this helps explain the skill a little bit and give some advice on how to use it =).