A tide clock (also known as a marine clock) is a nautical instrument that gives a reading on high and low tides. This is great for boat owners and surfers to know when to head out for a surf or put the boat in for a spot of fishing. We stock tide clocks that can be wall mounted at home or at work, along with nautical tide blocks which can be fitted in your boat. Nautical tide clocks are made from durable materials and seals which can withstand the harsh conditions of salt water and the sea.