How to know the current tide?

[Riddick_2K 193]

As in the title: Is there a system to know what level the sea tide is at at a specific moment?
I think we all know by now that Chernarus also has tides and that a good way to "hide" stuff is to put it in crates, trunks and barrels under water.
Lakes and ponds have a constant water level, but very few have the level to hide even the barrels. The sea is a good solution, because the coast is quite long, but it has the "problem" of the tides:
If you put a barrel too close and at high tide, as lower as it goes out you see it out of the water and it's no longer safe.
If you put a barrel too far away and at low tide, after you can't reach it a good portion of the time.
To get it "right" you would need to know the tide level at the moment you place it... but how do you know the tide level?
Without having to travel kilometers to observe a known point, obviously...
Is there any table, calendar or calculation that can be done to get the current tide level?
I hope the Google translations are understandable.