Once connected, select the option to share your location. The iPhone will record your current location and send it via satellite to the selected contact. During this process, it is important to keep the device steady and follow the visual guidance until the transmission is complete.
It might be a good idea to add a small offset to the value inside the logarithm, avoiding precision errors near 0. Here’s what all that looks like in code:，详情可参考电影
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return t - sqrt(a) * (u * radical - v * log(0.001f + u + radical)) / 2.0f;