Tregantle is infamous within the armed forces because many of the rifle ranges located there slope steeply down towards the sea.

It is also used by specialist Royal Naval EW teams (FEWSG) for the monitoring of ship's communications in the area.

FEWSG operate specialist coded transmission scenarios from Tregantle Fort and surrounding areas for Naval warships to decode at sea as part of an ongoing training schedule.

[4] A few hundred yards southeast of Tregantle Fort, along the north side of the road, there was constructed in the 1890s a battery of four 9-inch muzzle-loading guns on "high-angle" mountings.

These were intended to fire shells along a high curving trajectory to more easily penetrate the decks of ships at sea to the south.