"This is definitely a unique event. It is awesome to come back here every year and do it," Capp said. "It is great fun and I think it really helps my training a lot for the 1500 as it helps with your toughness.
"Navigation is definitely the biggest challenge. Choosing lines depending on currents and whether you think you are confident enough to go out in the stronger water and get more pull around or go through the rocks."
Capp is happy with his recent form, building to the nationals in a few months' time.
"I am really happy with how it is going and I am looking forward to the nationals in April. I am just looking forward to swimming this year as it should be a good year."
Miller, 18, followed up her Bridge to Bridge win on Saturday with another convincing display to win by five minutes in 48.03, with Maia Bryant second and Sarah Mortimer third.
Miller swam most of the way in a group with male colleagues from the Mount Maunganui Surf Club, which she said helped her swim such a fast time to finish in 7th place overall.
She said they had some minor drama avoiding the rocks but the lifeguards advised the swimmers where to go.
"We were quite close to the rocks at one point and the lifeguards kind of told us to move away.
"One of the guys hit one but it was not really anything too bad. We were swimming very close to the Mount though ... The tide was going out really fast so we went out into the channel a little bit and it picked us up which gave us a big wash from that before we came straight back in. The channel definitely helped."