[Mobhack]

An artillery type formation of type 4 is a naval bombardment unit for the assaulter in a beach assault - he gets those listed instead of field artillery. Defender sees field artillery as usual and will not be offered any naval artillery. So those "Guarda costa" creations are useless, and have been since the NSDOB days I superpose, so you are probably the first person since then to notice. The original creator obviously did not test his edits".

However, changing the formation type to the dame as for regular fortification may then cause the naval forts to come up in normal assaults...

If building a scenario, but fortifications and then change to one of the naval forts in the Editor. But for generated battles, I would stick to normal forts. The cure probably will be to change the formation type and put an X3 radio code on these things.