Brown finished third in his U23 A final, while Brooke and Nossiter finished fourth and sixth respectively in what was their first nationals in the U23 grade.
Tanner, also her first season in U23 class, finished fourth in the 500m and sixth in the 200m.
Simon, at 16, had also jumped up a grade this season competing in the U18 grade where she ran seventh in her K1 final.
"To gain a spot in the age group trials each paddler must make an A final in the K1 and our five all did that. The boys did particlularly well though when they stepped up to the teams races. Max teamed with Kurtis Imrie from the Mana club to just get pipped on the line for bronze in the men's open K2. They were pipped by two guys that had trialled for Olympic spots, " Scott said.
"Max, Aiden and Toby then teamed up with Daniel McDowell from Christchurch to finish second in the men's open K4 - that was an exceptional effort. Daniel has been up here in Whanganui training for a while now and it is also his first time competing at this level."
Meanwhile, new national men's kayak coach Frederic Loyer was impressed with the potential in some of the younger paddlers at the nationals, with Bay of Plenty's Taris Harker and Whanganui's Max Brown and Toby Brooke among the younger brigade shining in the open division.
Loyer is hoping 2020 will herald a new era in the sport for Kiwi males, having arrived only last week to take up his new role after six years coaching in Canada and 15 years in his native France.
"My first job is to connect with the clubs, see the athletes in their own environments and prove my expertise and my skills as soon as possible," Loyer said.
"I would like to put the athletes out of their comfort zone and challenge them every day. "