If you need to use the locator function, you need to purchase a head with a 512Hz frequency and a 512Hz positioning receiver; two accessories are required to use the positioning function.
Here are the purchase links for the lens with 512Hz: https://www.amazon.com/dp/B0CCPJD5C4?ref=myi_title_dp&th=1 and the positioning receiver: https://www.amazon.com/dp/B09L11BMQ5
By vevor