If you want reliable GPS, dont buy this watch.
Purchased a Band 4 Pro (previously having used a Band 2 Pro) and Ive had problems with the GPS on this watch since purchase. It sometimes works and sometimes doesnt, each time Huawei suggest a series of resets, reboots, re-pairing etc but it seems totally random as to what works. Updating software doesnt resolve the issue either. The GPS will randomly lag behind by typically 25-30% (I know this as I do the same two distance runs regularly) so it demoralising to know halfway through the first KM that the watch isnt tracking you properly. The watch itself is nice enough but most people will buy this for is GPS which is very flawed.