Water colour: dark blue is slow water, bright turquoise is a fast current. Swim in the bright water to go faster.
Moving streaks show which way the water flows and how fast.
▲ 0.8Numbers along the bottom: the current to your left, under you and to your right, in m/s. Green is a strong push.
Grey-blue water is colder than 14 °C. It tires you faster.
White dashed line on the map: a buoy set free with you at the start. It cannot swim: it only drifts with the water.
Stripes on the map, grey sky in the view: storm winds. Gusts push you sideways.