Then something use Corvus title, he can change position and speed of his raider or only position?

Quote

Deploy Ships:

Starting with the first player, the players take turns deploying their forces into the setup area. A single deployment turn consists of placing one ship or two squadrons.

◊ Ships must be placed within their player’s deployment zones. When a player places a ship, he must set its

speed dial to a speed available on its speed chart.

This is the relevant rules from the Rules Reference. Seems pretty clear that when you "re-deploy" you take a new deployment turn with the Corvus. So you place the ship in a new spot. And whenever you place a ship, you get to set its speed dial.

So I think it is both: change position and (potentially) reset its speed dial.

Correct, new deployment, new speed.