I saw a tide clock on ebay today, had a single hand with a 'high' at the
top, a 'low' at the bottom and that was pretty much it. All this for the
bargan price of AU$70.

It occured to me that all it was, is a standard analogue clock with the
second and minute hand removed. open tha face and glue on a bit of paper,
right high at 12 and low at 6 and you have your very own homebuilt version.
set it to high or low when you know the tide is there and you'll always have
the tide at a glance. a lot cheaper than the rip curl tide master watch i
bought a few years ago and lost somewhere in asia

Shaun