How to Use a Tide Table for a Coastal Visit

How do you use a tide table for a coastal visit without mistaking it for a map of the shore? Start with the table’s named location, date, time zone and stated datum, then check local access advice and the route itself. A tide table predicts times and, where provided, water levels for a particular place; it does not show whether a path will stay dry or how far waves may run up the shore.

This distinction matters on beaches, rocky shelves, harbour edges and causeways. Tide predictions describe expected water levels against a reference, while the route’s shape, wave conditions and local restrictions determine what you may encounter on the ground. Use an authoritative local tide source and follow the relevant harbour, coastguard or site guidance when planning access.

Choose the station

Look for a table that names your destination, or a reference station that the table provider or local authority says applies to it. A nearby harbour’s predictions may not describe a cove or channel accurately simply because it is close by. Headlands, bays and narrow waterways can make local conditions differ.

Check the table’s notes about coverage and any advice from the harbour authority, coastguard, coastal access organisation or site information board. If you cannot establish which station is appropriate, seek guidance from a local official source rather than treating the nearest station as a substitute.

Read times and datum

Check that the date and local time match your visit. The table may list high water and low water, the predicted turning points between rising and falling water. It may also give predicted heights in relation to a datum: a named reference surface used for recording or charting water levels.

The datum is not a mark on the beach and does not tell you where waves will reach. Different tide providers may explain their tables and reference surfaces in different ways, so follow the provider’s notes for the particular table. For access decisions, use the appropriate local instructions alongside the prediction.

A tide table is like a timetable pinned beside a doorway: it indicates when a change is expected, but it cannot show whether the path beyond the door is clear.

Plan the route

Identify the route’s most restrictive point before setting out. It might be a low crossing, a causeway, a rocky shelf, a passage beneath cliffs or an enclosed area with a limited exit. Note the relevant predicted tide times, then account for the outward walk, a pause and the return. Do not assume that arriving near low water leaves the route open for the whole visit.

Imagine you plan to cross a low beach to reach a headland. The local access notice identifies a reference-station table as relevant and warns that water can cut off the crossing as the tide rises. Your plan is to walk to the headland and return before that access changes. On arrival, you observe water washing across the crossing; the decision rule is to avoid the crossing whenever water reaches it, so you take a higher accessible path instead. The visible result is that your route no longer depends on the wet crossing; the trade-off is a different approach to the visit.

Check the shore

Before setting out, check current information from a dependable local source, such as a coastguard notice, harbour authority, coastal access organisation or site information board. Look for closures, tide-dependent access instructions and warnings relevant to the destination.

On arrival, pause in a safe place. Observe whether the route is wet or submerged, where waves reach, whether the return line remains open and what the ground is like. Wet rock, loose stones, mud and algae can make a route difficult even when exposed. Keep away from cliff edges, and do not enter an enclosed shore area if rising water could cover the exit.

Tide predictions do not describe every wave or local condition. If the shore differs from your plan, or official advice conflicts with it, choose a higher route or leave the visit for another time. For specific access or safety advice, follow the relevant local authority or coastguard instructions.

Make a route decision

• Station: Check whether the table names your destination or a reference station endorsed by local guidance. If it does, use it as a timing aid; if it does not, seek a relevant local table or advice before relying on it.
• Date and time: Check that the table’s date and local time match your visit. If they do, use the listed predictions as planning information; if they do not, find the correct table before setting a route.
• Datum: Check the reference surface and the provider’s explanation of any listed heights. If the datum is clear, interpret the height only in that stated context; if it is unclear, do not use the figure to judge the shore and seek the provider’s guidance.
• Route: Check for low crossings, causeways and enclosed areas with limited exits. If local advice and the route leave a clear way back, continue assessing conditions; if you cannot identify a usable return, choose a different route.
• Local notices: Check for closures or tide and wave warnings. If access is open and the advice fits your plan, continue assessing the shore; if an official notice rules out access, do not enter.
• Water and waves: From a safe place, observe whether water or waves are reaching the route. If the passage is clear and local guidance supports access, proceed cautiously; if water crosses it or waves make it unsafe, turn back or use a higher route.
• Ground: Check for wet rock, loose stones, mud or algae. If the footing is manageable for your group, continue carefully; if not, avoid that section, choose firmer ground or end the visit.
• Turning point: Before starting, identify a visible change or local instruction that means you will return. If that point is reached, turn back; if conditions worsen earlier, act on the earlier warning rather than waiting for the planned time.

Questions about tide tables?

Choose before entering

Just before starting, compare the tide table for your coastal visit with current local advice and what you can see from a safe place. If the station is relevant, the route remains open and conditions fit the official guidance, proceed with a clear plan for returning. If those sources conflict, give priority to official access instructions and the observed shore rather than a predicted time alone.

Keep the station, date, time and datum in view, but treat them as context for a decision, not permission to cross. The useful question is whether the route and its exit remain suitable under the conditions you can observe; if you cannot answer that clearly, choose another way to enjoy the coast.