After the brief romantic entanglement, female 1H1 settled down with male 374 and they became the second pair of breeding ospreys in southern England since 1847.
They hatched two chicks last year in early June.
The charity has set up 10 nest platforms in Poole Harbour hoping a third breeding pair will arrive this year.
Many of the south of England ospreys are ringed but do not carry trackers. They return from their annual migration, usually to western Africa, through late March.
A reintroduction programme began in Poole Harbour in 2017 with the long-term aim of establishing a breeding population.