I assume that you do not have any instructions, this being the case, then you can obtain them by going to their web site "columbia.com" and in the search box (upper right) enter "watches".
You will see in the middle of the page a section called "timing" click on the link "PDF instruction.................." and a long list of watches appears. You can either scroll down until you find your watch or enter the watch type number (on the back of your watch?) in the search box.
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