The picture below shows a NE swell hitting the Mount Maunganui and Matakana coastline. The picture shows the effects of the island, entrance channel and the ebb-tidal delta offshore from Tauranga / Mount Maunganui on the swell hitting this stretch of coastline. The wobbliness of the swell lines hitting Matakana are due to the ebb-tidal delta offshore (i.e. Matakana Bank), and helps setup the peaky barreling waves that Matakana is known for. Similar situations are found at Aromoana near Dunedin and South Stradbroke Island on the Gold Coast Australia.

The picture illustrates the spatial scale used in some of the modeling by MetOcean Solutions and released by Swellmap.com