To qualify for the highest award of £20,000, the timekeeper would have to show that on arrival in Jamaica it had not exceeded a total loss or gain of 1 minute 54 seconds of time since it had been set by Mr Robertson at Portsmouth on 7 November, some 81 days previously. This performance would be the equivalent of a variation of under 1 1/2 seconds a day, a standard of timekeeping which, even to-day,could be achieved by very few high grade watches.