On 12 November, you are taking a time tick using the 1600 GMT BBC Broadcast. You hear five pulses followed by a longer pulse. At the start of the longer pulse you start a stopwatch. You stop the stopwatch at the same time reading the chronometer with the following results: stopwatch 03m 19s, chronometer 15h 59m 46s. What is the chronometer error?

Correct Answer: Option A — 03m 33s slow

Chronometer error is calculated by subtracting the elapsed time (stopwatch) from the chronometer time at the signal. At 16:00:00, the chronometer reads 15:59:46. Adding the 3m 19s elapsed time results in 16:03:05. The difference between the signal time (16:00:00) and the chronometer's indicated time (16:03:33) confirms the chronometer is 3m 33s slow.