This site has been developed by digimap with the hope that it will assist with the enjoyment of your boating.

Guernsey Tides

The calculates the times you should be able to pass over the sill of the respective marina. It is calculated based on the tidal predictions, but can vary due to barometric pressure, wind direction and strength and many other factors. Additionally, gates may be affected by the speed of the flow of water over the gate.

The predictions are less accurate during neap tides when the height of the tide changes slowly.

The system does take into account the dropping gates at QEII and St Sampsons marinas.

At the bottom of the page is the Tide Height above Chart Datum each half hour.

Marina Times

This allows you to select a marina and then select a date range and will show you the times for each day. This was a much requested feature, especially if you are planning to be away for a few days. Please do check you have the correct marina selected. It should remember your chosen marina on your device.

 

We do hope you enjoy the site and will think of digimap for all your mapping requirements.

Anchoring

This is a new feature. You go to Herm and moor your boat at shell beach. This raises a number of questions.

  • How much chain should I put out to be OK at heigh tide based on the 4x depth guideline?
  • Will I dry out?
  • If I take my dinghy ashore, when will the tide be back at this level so it does not float away?

This page provides the answers.

tides

In the screen shot above, the tide is falling and we have entered a depth of 3 metres under the keel. This is not the figure on your depth sounder so beware. If your depth sounder says the water is 4m deep and you draw 1m then there is 3m under the keel.

The time and depth at the next high tide is calculated and this calculates the anchor chain and rope required if you are going to stay until the next high tide. You may wish to increase the length in strong tides and / or rough conditions.

The next box shows the depth under the keel at low tide. In this example the boat will go aground and the next box shows this will happen at 15:23. The time the tide will be back at the same height will be 19:48, so your dinghy on the beach should be safe until then.

Do have a play, test the results and let me know of any feedback.