Apple Watch can tell swimmers some accurate information about their swimming exercises.

According to foreign media SlashGear, Apple Watch may soon tell swimmers where to use radio navigation technology to find out where they are. Apple won a patent on "radio navigation for swimmers" this week. This may be the first time a smart watch has used this technology, which is unique to any smart watch or wearable device.
Apple gave some hints about this technology when it first showed the Apple Watch Series 2 in September 2016.
In this patent, Apple describes how to configure a mobile device to use RF signals to estimate its own location. The position of the watch on the wearer's arm is taken into account. Swimmers using second and third generation Apple Watches already know that the device can tell them some pretty amazing information about their swimming exercises. According to Apple's instructions, Apple Watch can provide information about the speed and distance of fitness applications. The system also provides vibration feedback to the user to let them know when they are off track. The system will use a variety of potential sources such as wireless local area networks (WLANs), cellular towers or other close-range RF sources.
The latest version of the Apple Watch uses gyroscopes and accelerometers to track every stroke in the water. Swimmers can use these two techniques to monitor each stroke. Apple Watch also uses GPS - but GPS does not work well when the device is underwater. Therefore, information collected from other sensors in the device is also utilized - the entire information is encapsulated into Apple's algorithm to illustrate what happened, when, where, and how.

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