I have an Instinct 3 That I use intensively for open water swimming. I can't understand why, while the water temperture is shown live with a 1/10th of a degree precision, in the stats it is rounded to the nearest full degree. If this is a question of data size, I would personally much prefer a lower temporal resolution (for example, a 10 sec average - of course corrected for air temperature) with a 1/10th of a degree, or even rounded to the nearest half degree. There is serious difference between 17.6 and 18.4, but both are shown as 18...
