North Island tidal currents

Twice-daily M2 tidal currents animation around the North Island of New Zealand based on a TIDE2D model.

The currents at a model grid point are represented by a vector with its length scaled to the current speed and the arrow points in the direction of flow. Every 4th model grid point is plotted at ~1 hour intervals. N.B. Cape Reinga is at the top of the North Island.