Calibrate Watch?

[Teddysjam]

My Watch series 4 is scheduled for delivery today I’m coming from the series 1 non-gps. I usually run on a treadmill at gym so I wanted the best or the closest to an accurate reading. When I had the non-gps series 1 i ran 2 10 minute runs (20 min total) with phone in my hand for gps. 2 questions since series 4 has gps no phone is needed correct to calibrate this watch And also does calibrating watch make a big difference or just a mind thing. Also I forgot to add I know I need to run outside on a flat surface with good signal before using in gym.

 

[tromboneaholic]

Apple recommends calibrating it outdoors in a flat area.

https://support.apple.com/sl-si/HT204516

Calibrate your Apple Watch

1. While wearing your Apple Watch, go to a flat, open outdoor area that offers good GPS reception and clear skies.
2. If you have Apple Watch Series 2 or later, you just need your Apple Watch. If you have Apple Watch Series 1 or earlier, bring your iPhone for GPS. Hold your iPhone in your hand, or wear it on an armband or waistband.
3. Open the Workout app. To start, tap Outdoor Walk or Outdoor Run. To set a goal before starting, tap
   
   .
4. Walk or run at your normal pace for about 20 minutes

 

[Teddysjam]

Apple recommends calibrating it outdoors in a flat area.

https://support.apple.com/sl-si/HT204516

Calibrate your Apple Watch

1. While wearing your Apple Watch, go to a flat, open outdoor area that offers good GPS reception and clear skies.
2. If you have Apple Watch Series 2 or later, you just need your Apple Watch. If you have Apple Watch Series 1 or earlier, bring your iPhone for GPS. Hold your iPhone in your hand, or wear it on an armband or waistband.
3. Open the Workout app. To start, tap Outdoor Walk or Outdoor Run. To set a goal before starting, tap
   
   .
4. Walk or run at your normal pace for about 20 minutes

Thanks. I forgot to add, I know I had to run outside first before using in gym. Thanks for posting so I could edit post forgot to include thanks.