The Duke of York is set to help celebrate Norwich Sea Cadets' centenary.
Prince Andrew will be visiting the unit, based near Foundry Bridge, on Wednesday.
During his visit, the cadets will demonstrate some boat displays on the River Wensum and give a tour of their vessel, the TS Lord Nelson.
The duke will also unveil a plaque celebrating the unit's 100th anniversary. He is due to visit the unit in the afternoon.
It is the second time Prince Andrew has visited the Norwich Sea Cadets. He last visited in 2005.
As previously reported, the cadets will celebrate their centenary this June.
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