It may also help to consider an example: in a democracy, you vote on a law without experimentation, so you don’t know if it will work. And, you are either voting for the law itself, or for a representative who will hopefully pass such a law.
In contrast, technocracy surveys the population, to see what is valued, and then experts seek and attempt options for meeting those values. The experts settle on ways to measure or compare outcomes of their attempts, then they select the option which had the best outcome — the data makes the final decision of “which policy to implement”. The population only informs the experts what sorts of things they care about. In technocracy, people don’t vote on specific laws, nor do they vote on representatives. They express preference, and data tells the experts which decision will best meet those preferences. Like the navigator, who doesn’t choose which way to go — they find out which way to go, data guiding.