Workers responsible for protecting shipping and sailors along Britain's coastline will go on strike again in Harwich on Wednesday.
Earlier this month, staff at Trinity House walked out for the first time in 500 years in a dispute over pay.
Members of the UNITE union will stage another protest on Wednesday lunchtime, after workers voted to take action against what's been described as "years of below inflation pay rises."
“The seafarers are dedicated professionals firmly committed to safety in the navigation of the sea lanes around the British Isles," Unite regional officer Miles Hubbard said.
“However, the fact that they staged the first strike in Trinity House’ 505-year-old history on 3 April underlines their strength of feeling on the pay issue.
"In 2017, the employer imposed a one per cent pay increase which Unite members voted overwhelmingly to reject. Talks, including a pay increase for the year starting April 2018, continued, but eventually run aground.
“Unless there is substantial movement by Trinity House management, more industrial action is on the cards during the spring and early summer.”