Can this work in the Midwest? I know we don't have oceans but it could it help us keep track of them too?
Sure, it's just a clock. Set it to the time of high tide where ever you want and it will continue to show you the hours to the next tide. It does not know you are not at the water. I love the clock.
What happens when the battery runs out?
It's powered by a standard AA battery. My parents had their original for 25 years!
will this work in NewZealand?
It works on the Tasman sea side of New Zealand (the side closest to Australia) It does not work on the other side. See www.tideclocks.com to see where the tide clock works. It is under "About" then "where tide clocks work"
Where can you get a replacement tide arm hand?
Send an email to us at firstname.lastname@example.org and ask for a new hand and we will send you one for free.Just include your address in the email.