Royal Naval Training Establishment Shotley, known in the Royal Navy as HMS Ganges, was a naval training establishment at Shotley, near Ipswich in Suffolk. Starting in 1905, it trained boys for naval service until it closed in 1976, following the raising of the school leaving age from 15 to 16. It had a mixed reputation in the Royal Navy, both for its reputed harsh methods of training boys in order to turn out professionally able, self-reliant ratings and for the professionalism of its former trainees. It is particularly famous for its 143-foot (44 m) high mast which all boys under training were required to ascend, at least to the half-moon and for the mast manning ceremonies held whenever a dignitary visited the establishment.
During the later 1980s and 1990s RNTE Shotley was used as a residential centre for civilian police officers to complete their basic training. Forces which used this centre included Essex, Suffolk, Norfolk, Bedfordshire, Hertfordshire, Cambridgeshire, Thames Valley and South Wales. Local police forces continued to use the site in 2007.
In Arthur Ransome's children's novels We Didn't Mean to Go to Sea and Secret Water, the character Commander Walker is an officer stationed at Shotley.
Coordinates: 51°57′25″N 1°16′19″E / 51.957°N 1.272°E