LightHouse Charts dynamic current graphic
When the Tides layer is enabled or when the Chart app is in Tides mode, the standard Current station symbol is replaced with a dynamic Current graphic. Arrows are used to indicate the direction of current flow. The size and color of the arrow indicates the strength of the current:

Yellow small arrow: 0 Knots to 1.0 Knots (Leisure chart style)
Orange medium arrow: 1.1 Knots to 2.0 Knots (Leisure chart style)
Red large arrow: Greater than 2.0 Knots (Leisure chart style)
Yellow small arrow: 0 Knots to 1.0 Knots (Government chart style)
Orange medium arrow: 1.1 Knots to 2.0 Knots (Government chart style)
Red large arrow: Greater than 2.0 Knots (Government chart style)