Gannets are pretty thin on the ground this time of year at Muriwai. Give it a few more months and spring/summer should see them by the mass.
A few interesting facts:
- Gannets eyes are far enough forward to give them binocular vision and allow them to judge distance well – which comes in handy when hunting/fishing
- With the ability to achieve speeds of 100Kph (60Mph) in dive, they can catch fish deeper than many other surface diving birds
- Unlike our Terns close relatives (see a few days back), Gannets are in no way at risk population wise with a LC (least concern) rating – their numbers are growing
MikeHawkey.com 
I really like this place, especially when there are tons of them gabbling around all at once.
Its a great sight!