To be fair to the interviewers, it appears that they were making an attempt to see if a candidate knew anything about the pilotage district. There’s no need for a candidate to study charts at the pre-interview stage, but an adequate amount of internet research so that you can answer at least some of this question would show that a candidate was keen. The cost to train a Pilot is very high, and if there was a choice between a candidate who has done no basic research and one who could at least name one or two of the terminals, this would show an interviewer that the latter had the initiative to learn even a little bit about the area. I’m presuming this interview was for the Humber, containing some of the busiest ports in Europe. There are 17,000 commercial vessel movements on the Humber Estuary per year. Immingham and Grimsby handles more cargo tonnes per year than any other port in the UK, not to mention being one of the most major import/export vehicle hubs in the Europe. The River Ouse is the most surveyed stretch of water in the Uk. (That info took 2 minutes to find on Google)
Excellent question to determine a candidates ability to cope with stressful situations. Piloting is highly stressful at times and a candidate needs to be able to deal with that effectively and concentrate on the task at hand.