The following article will explain how distance and heart rate is measured while open water swimming, provide useful tips and troubleshooting steps.
When swimming in Open water sport mode, your Suunto tracks distance via GPS. Even though the watch’s algorithm is optimized for challenging environments, the tracking may be influenced by the following external factors:
The following tips may help improve the distance measurement via GPS:
Most Suunto watches track heart rate from your wrist during exercise. For swimming we highly recommend using a chest heart rate sensor since the wrist heart rate sensor may not provide accurate readings as water passing under the watch affects the optical sensor's ability to read heart rate accurately.
Keep in mind when using a HR belt for swimming: