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If you are in a virtual tour
Google Earth also offers virtual tours of popular spots around the world. This offers a lot of insight and an immersive way to experience your favourite tourist attractions, without stepping out of the house. Whenever you initiate a virtual tour on Google Earth, the ruler feature automatically gets greyed out. This is done with the intention to keep you invested in the tour, rather then getting distracted by the other features. So, if you are one of these virtual tours, and you want to use the ruler, simply exit the tour and the feature will get re-activated.