Track the tide with Harbormaster, a precision east coast tide clock.  It makes it easy to track the tide at your favorite coastal location, regardless of where you are.  Powered by a single AA battery (included), Harbormaster tracks according to the average time between lunar high tides in the Atlantic Ocean (12 hrs, 25 min.). Fluctuations in conditions, location and the distance of the Moon from Earth can effect this average. However, over a lunar month, your Harbormaster tide clock will provide a practical indication of local tides. https://youtu.be/JHBqZoGEk_E

Cronus time and tide clock provides you with a digital display of time, date and east coast tide. Time is displayed in either 12- or 24-hour mode and automatically adjusts for daylight savings. Date is displayed in month/day format. Tide counts down to east coast high or low tide in 1/2-hour increments via 12 LEDs. AC powered, with a Lithium battery back-up to maintain time and date during power outages. It can be enjoyed on its own or as a compliment to other digital instruments.