Yes. All compass watches need to be calibrated before they can be used. How you calibrate a compass watch will vary depending on the brand and model of your watch. However, most compass watches come with a calibration instruction booklet to guide you through the process. It is essential to follow these instructions strictly, as incorrect calibration can lead to inaccurate readings. Mostly calibration is done by comparing it to a different compass. Still, you will need to ensure that the compass is accurate. Some compass watches will come already calibrated and ready to go, while others will require manual calibration.