"Don was strong guy, a very fit athlete. He excelled at school in various sports as well, and was good in the first XV (rugby) at Wanganui Tech.
Gemmell captained the team.
"He had a great sense of humour, a bit of a practical joker. We went to regattas all around New Zealand and he was a great guy to travel with," Aitchison said.
Gemmell once flew a Tiger Moth to Queenstown for a regatta, telling the team he would buzz over the main street to let them know to pick him up from the airport, Aitchison said.
"He did such a low buzz down the main street that he scared the hell out of everyone, he was almost at power pole level.
"The guy who flew down too said 'I'm not going back with him, that's for sure'."
Tong said he had regularly accompanied Gemmell on flights over the years.
"We were pretty close and always got on well together.
"You couldn't ask for a more lively guy to have as your mate, that's for sure. We certainly had some fun."
While there may have been the odd accident, Mentink said her dad took the responsibility of transporting people very seriously.
"He instilled in us (his children) an innate sense of responsibility, whether that's respecting the mountain when skiing or always being mindful of the sea.
"Now we've instilled that in our kids."
Gemmell was "always there" as a father and husband, Mentink said
He was married to his wife Janet for 61 years.
"Dad always encouraged us to be the best we could be. He was incredible supportive, and would be on the sidelines for my brother's rugby and our swimming.
"We experienced a lot of cool things because that's the sort of person he was. We skied and we dived, and he always liked a challenge. He made us a part of that."
It wasn't just on the water where Gemmell excelled.
He and his brother Colin took over Gemmell's Footwear from their father in the 1950s and ran the business for more than 40 years.
"Dad went and worked out at the Whanganui port for 10 years after that, doing all the hydrographic work," Mentink said.
"He taught himself how to use computers. That was a really learning curve for him and he loved it. He was always a great man of the sea."
Don Gemmell leaves behind his wife Janet, children Linda and Bruce, son-in-law Richard, grandchildren Sam, Michalla, Ginny, Nick and Jono, and great-grandchildren Adaline and Henry.