User blog comment:BasakaNZ/Thoughts and musings on effective ship levelling/@comment-24847681-20140502014351

I think 1-5-1 is better than 1-1-1 for levelling your DD or CL (if you already have sona+depth charge)

Composition: DD or CL (put sona and depth charge in your DD or CL)

Recommended leveling: 1-20

Requirement ship types: DD, CL

How: The first node on world 1-5 only has a single submarine, which you can usually kill in one shot with combo sonar + depth charge. Each run gains you +14 morale and 540 exp (or 450 exp in case you get crossing T-disadvantage and can not kill the submarine but at least your ship won't take damage from it).

 Pros:

- Ships never get tired

- The fastest levelling ships place for low level ships (540 exp per run)

- Each run cost 3 fuel and 4 ammo (for DD), 5 fuel and 5 ammo (for CL). It absolutely worth for 540 exp

 Cons:

- Boring

- Inefficient at levels higher than 25

- Mediocre drops

- If you get crossing T-disadvantage and your ship have a miss shot then you know what i mean :D (wait few minutes or 1 bucket, it depend on your choice :3 )