G-EMMA,
If you are flying a heading of 270 magnetic (deviation 5W and variation 8E) and the wind from the met office is 180/20. what is the true track made good?.
The nature of weather in the UK is that thunderstorms move from place to place and it is basic knowledge that if there is a thunder storm over your destination or there is soon to be, you hold off for the relatively short period that is required for the shower to pass through.
It's all about demonstrating understanding.
In the USA they use inches of mercury as the altimeter setting. Standard pressure being 29.92
Since the range of pressure precludes a pressure of 39.92, it is usual for the '2' to be dropped and 29.92 is transmitted as 992.
You can se that there is a big difference between a QNH of 992mb and 1013.2mb (29.92 inches hg)
Following from an incident some years back the standard of adding the word "milibars" after all pressure settings of less than 1000mb came into effect to prevent the misunderstanding possible especially with US operators in the UK.
Regards,
DFC