What does Avisos do in AoE3?

Ships 1 Ironclad; Ships 1 Steamer; Steamer: becomes available; Ironclad: becomes available, build limit +2. The game says: "Ships 1 Ironclad and 1 Steamer. Replaces their archaic equivalents at the Dock."

Home City card

Avisos

Avisos (tech ID DEHCREVAvisos) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Ships 1 Ironclad; Ships 1 Steamer; Steamer: becomes available; Ironclad: becomes available, build limit +2. It hands over about 2,000 resources' worth.

Quick answers (3)

Which civilizations have the Avisos card?: Germans.
What does Avisos do in AoE3?: Ships 1 Ironclad; Ships 1 Steamer; Steamer: becomes available; Ironclad: becomes available, build limit +2. The game says: "Ships 1 Ironclad and 1 Steamer. Replaces their archaic equivalents at the Dock."
What is the tech ID of Avisos?: DEHCREVAvisos.

Ships 1 Ironclad and 1 Steamer. Replaces their archaic equivalents at the Dock.

What it does

Ships 1 Ironclad(unit)
Ships 1 Steamer(unit)
Steamer: becomes available
Ironclad: becomes available, build limit +2

4 further effects (interface, visuals or AI) not listed.

What it hands over

1 × Ironclad1,100 each
1 × Steamer900 each

Total ≈ 2,000 resources — units at their train cost, crates and animals at what they hold.

Cost: 1
Sent from: IV
Times it can be sent: 1
Game ID: DEHCREVAvisos

In these decks

GermansIV×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).