Apple Watch (series 3) is one of the best fitness trackers I have ever used up close, I am not saying this because it was made by Apple, but because of the amount of satisfaction I derived from using it, especially now I’ve learned how to Calibrate iPhone GPS. However, I have found a new love in Fitbit Ionic but it doesn’t mean that Apple watch isn’t good, it’s all about choice and preferences.
The smartwatch is indeed a wonderful fitness tracking device that is preferred by many today. However, due to the differences in people, there is bound to be differences in the mode and manners they being used, thereby resulting in different results at different times.
Be that as it may, I am pretty sure that you’d agree with me that all these difference wouldn’t matter provided your trackers give you an accurate tracking and measure. And to get those reading correct and accurate, your watch got to be calibrated properly, and this what you are going to learn in this article, how to calibrate an Apple Watch for accurate pace and calorie measurements. 
But these readings can’t just up and get accurate on its own, you as the user have a tiny but important role to play. Once you are done playing your part, you can now let the watch to do its thing. Now, to make 100% sure that those reading are accurate, these are the things you need to do.
So I have to be honest with you here, my resources are limited, but if you have an Apple Watch Series 2 or 3 (I am 4 is included too), you really need to calibrate your Apple watch to make sure they give off accurate readings. Gladly, these models (Apple Watch 2 and 3) comes with onboard GPS that allows for automatic calibration, cool right? but you have to first be certain that the required setting which is Motion Calibration & Distance is switched on with your parent iPhone.

How to Enable Motion Calibration & Distance in iPhone / How to Calibrate iPhone GPS?

Calibrate iPhone GPS

To enable Motion Calibration & Distance in iPhone, first, you’d have to make sure that iPhone location services are up and running by going to your iPhone’s settings menu, tap Privacy, then Location Services.
The next thing to do is to scroll to the very bottom of the menu and tap on System Services. After that, you should see an option to toggle Motion Calibration & Distance. Let the above screenshot serve as a guide.
The slight hindrance to this is in the case of Series 1 or 0 Watch, because of their dependence on iPhone’s GPS, you may have to carry your phone few times (or maybe more) each time you want to leave your home for a run by either strapping your iPhone onto your arm/waistband or just hold it in your hand (I wouldn’t recommend this last option).
The second hindrance is that you may not walk or run in some places with mountains and hills or too many other elements that might block the signal range. As a matter of fact, to ensure and maintain maximum accuracy, your workout area should not only be flat and have solid GPS reception.
Also, you may have to do this several times so as to get a perfect baseline and measurement for calibration. And it best if you do not calibrate when it’s either overcast or raining.
The situation is easier and different with Watch OS 4, a single workout may be enough to set a baseline. Just open the Workout app, then scroll until you find Outdoor Run or Outdoor Walk. Tap the “…” button over either one and set a 20-minute goal.
Please note that if your fitness regime includes both running and walking, then be sure to do separate 20-minute sessions for both paces. Once basic calibration is complete, a Series 1/0 Watch should continue to refine its performance whenever you’re performing an outdoor workout.
Still on how to Calibrate iPhone GPS, finally, this is what I personally love to do with every smartwatch/fitness tracker I own, so I am advising every other watch other to do the same. 

Calibrate iPhone GPS

On every track you own, you have to make sure your correct details are in your smartwatch. To do that, go to your watch app’s Health menu, located under the My Watch tab. 
Important details you need to have there include your age, height, gender, and weight because these figures are used to estimate things like calorie burn, and you know these things change with time, so if this isn’t kept up to date, calibration might not be accurate.

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