Sailing instruments aboard a Volvo Open 70 which give a vast amount of information such as true and apparent wind speed and direction, VMG (velocity made good), CMG (course made good), boat speed, depth, water temperature, repeats from the GPS navigation system all shown on various displays. On the mast, large sized displays are easy to see from anywhere in the cockpit; close to the helmsman and down at the navigator's desk, smaller displays are available. All can be switched to display a wide range of information.
A capsize where the boat goes completely upside down (turns turtle).
Lines on a weather map that join together points of equal barometric pressure. The resultant concentric figures are known as low pressure systems or depressions if the pressure decreases as you go towards the centre, as anticyclones or high pressure systems if the pressure increases towards the centre