User blog comment:Admiral Mikado/Extra Operations for Dummies: 4-5/@comment-25283939-20160903004245/@comment-24930367-20160912135606

Yes, you need a seaplane for artillery spotting. That one is especially good as backup if airstrike doesn't work as intended (which happens a lot for me and me only).

But Type 3 + WG will ensure that CAV deal higher damage to Harbour in chuuha. It's more like an insurance vs. Harbour.

In exchange, you will suffer a D-rank submarine node (unless one of the CAV brings seaplane bomber) and have to content with CAVs single-attacking things. And sometimes double-tapping things are better even if that's only scratch damage.