James Land, 43, recorded a four-minute video of youngsters in the communal changing areas in “various stages of undress” at a Chesterfield pool in September 2015.
The court heard one of his young victims was aged just three years old at the time and the children’s parents now feared the indecent images were now circulating on the internet for other paedophiles to view.
One of the parents said in a statement read out to the court he and his wife’s distress that videos showing the “private moment” may be accessed online would “never” leave them.
Others said they had lost all trust in using sports coaching facilities and all faith in those entrusted to protect their children.
Derby Crown Court heard Land worked in online safety for the police from 2017 in a preventative function with suspected underage computer offenders.
He also gave training for adults giving talks to children in online safety.
Sarah Slater, prosecuting, described how the PCSO was arrested a Derbyshire Constabulary’s Ripley headquarters as he arrived at work on May 20 last year.
A search of his Cromford home uncovered nine devices found to contain over 1,300 indecent images and videos of children – 369 category of them the most serious category A.
Ms Slater said police described children as young and two and three years old “visibly distressed and in pain”.
It is understood Land was downloading the material from 2018 onwards – although Ms Slater said some of the downloads went as far back as 2002.
The court heard another image found on Land’s devices showed him exposing his penis while working at Derbyshire Constabulary HQ.
Ms Slater described how another adult female victim was unaware Land had been secretly filming her until police visited her in the summer of 2021.
She was told they had uncovered seven indecent videos of her from his mobile phone.
Darren Whitehead, defending Land, said his client had offered an “unreserved apology” for what he had done and the impact on his victims.
He will be sentenced by a judge later today.
Land, now of Abergele, Wales, admitted downloading indecent photographs of children, possessing extreme pornographic images, possessing prohibited images of children and voyeurism.