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See my post here. It's not a GPS watch since it doesn't have GPS. Purely to calibrate stride length to better approximate distance for the accelerometer.

https://forums.macrumors.com/showthread.php?p=21227759

I get the fact that AW does not have GPS internally. However, it does have access to the GPS within the phone - correct? So, what you are saying is that the AW Workout app only "kind of" uses the GPS functions of the phone for calculating pace and distance (which means it needs to learn how to "simulate" accuracy). However, apps like MapMyRun are completely using the GPS for calculating pace and distance.
 
I'm saying those apps are apps on your phone and require the phone as their GPS receiver. Similarly pedometer apps rely on the comotion processor to get step data. But no phone, no app. The watch is meant to be independent of the phone if desired for activities but it can leverage the GPS in the phone to make its onboard sensors more accurate. This way when you run /walk/cycle you can still get to data without the need for the phone. The workflow decision is to rely solely on accelerometer data since the assumption is probably you will not want to be tethered to phone for workouts. Not opining on whether this is a good decision but for v 1.0 this is how they did it. Personally I wished they allowed you to use GPS as well to get map data.
 
I did my first run today with the AW and Fenix3, with AW results all over the place.

I started the run with using the Workout app. This was my usual 8 mile route, so I (and my fenix) know the mile splits well. At 3.1 miles, the AW Workout app had 2.70 miles. I stopped running, completed and shut down the Workout app.

Next I started the Strava app on the AW in running mode for the next .9 mile. Complete garbage. Pace was OK, but no distance was displayed on the screen. At the end of .9 mile (4 miles total for the run), I stopped running and stopped the Strava app. It had that segment as .2 miles.

At this point I was half way through my 8 mile run. I started up MapMyRun on the AW. For the next 4 miles MapMyRun and the fenix were nearly identical, and at the end of the final 4 miles of my run they were .01 different.

As everyone has said, the AW and the Workout app need time to calibrate. Although, I really don't understand why. If MapMyRun can get it right the 1st time (using the same GPS), what calibration is the Workout app doing??? I know some suggest that the Workout app is more stride and cadence based rather than GPS based. If so, is this for battery performance reasons.

Again, the need for calibration seems very strange. I've run with GPS watches for many, many years, and I don't recall ever having to calibrate them. I am aware that GPS accuracy is dependent on the software (along with settings and signal), and that GPS accuracy can vary from watch to watch, and across software/firmware versions for individual watches.

In any case, tomorrow I will try to stick with the workout app and let it continue to learn to see if gets closer to real life accuracy.

I can´t found the app MapMyRun for de AW? Where you find it?
 
Personally I wished they allowed you to use GPS as well to get map data.

This. It should be offered as an option. I always have my phone whilst running anyway so let me use the GPS constantly and have the map and accuracy benefits that provides.
 
I have noticed with Endomondo that if you use the watch all alone you can start a workout but it doesn't seem to pick up the iPhone gps WITHOUT opening the app on the phone itself. If you open the app on the phone, watch finds it quickly.

Joe
 
I use my Garmin 620 plus HRM run with all my running. It's the most accurate for me and now it's partner with Nike so now all my runs show up on my Nike site. I also like all the features the 620 offer to help me train for races from 5ks to a Full marathon
 
I can´t found the app MapMyRun for de AW? Where you find it?

it was already on my phone, and I manually selected it to install on the watch. I just check in the app store (from the Apple Watch app on the iPhone) and MapMyRun and MapMyRun+ are both listed.
 
Started my Nike+ run from the watch. only to to find 30min later there was a prompt asking to allow gps or not. Of course, It wasn't display on the watch. So the apps recorded 0km...
 
I use my Garmin 620 plus HRM run with all my running. It's the most accurate for me and now it's partner with Nike so now all my runs show up on my Nike site. I also like all the features the 620 offer to help me train for races from 5ks to a Full marathon

Love its wifi. Stop my run. Tap save. Walk into the house (sometimes it seems to upload automatically). Tap wifi sync. My run's data (maps, cadence, heart rate, speed, elevation, ... goes everywhere - my phone, cloud, computer, tablet. BOOM!
 
I have noticed with Endomondo that if you use the watch all alone you can start a workout but it doesn't seem to pick up the iPhone gps WITHOUT opening the app on the phone itself. If you open the app on the phone, watch finds it quickly.

Joe

I've been experimenting with both Runtastic and Endomondo. Both seem to be very accurate distance wise.

I noticed the same thing - the GPS was off in the watch app, if the app on the phone wasn't on. However, when I started the workout on the watch (with the app not active on the phone), I noticed that the GPS location indicator on the phone turned on to indicate that the "something" was using the GPS location services. On the watch, Endomondo now had the GPS+ indication. So I am assuming it turns on the phone GPS when you start the workout on the watch (the watch app must simply be a remote for the phone app). Runtastic appears to work the same.

More experimenting, but I can only do so many runs per day to test the apps :)

I used Endomondo this morning on my 8 mile run. My observations on Endomondo:

Distance was very accurate.

Pace was all over the place, but the pace announced at each split is accurate (pretty simple math and hard to mess up).

my watch battery only went down 3% during the 8 mile run. I assume this is because the Endomondo watch app isn't actually doing anything except acting as a remote display.
 
Some might see it as a benefits. Less distraction while running. When I run, I don't want to think about emails, tweets and other real life interaction. I am there to clear my mind and disconnect from the world for a short moment.
I agree with you 100% when I'm traing my focus is what im traing for. Some of these wear the AW while playing basketball so they can check their heart rate.
 
I've been going on my "walk around the neighborhood" with the Apple Watch on and my iPhone in my pocket, and it tells me the mile mark at the EXACT same spot every time, and always gives me the EXACT same distance when I get home. I've done it I think 3 times now with the same result. I think next time I'll try without having the iPhone with me.
 
I have tried every running app so far and Runtastic is the only one that works for me, and I don't like that. Runtastic is annoying because it shows average pace not current pace. I would much rather have current pace, average is useless to me.
...

Runtastic can be setup to show either or both. Press and hold on the Avg. Pace, a list should show up on the bottom of the screen where you can select what to show in the 'selected window'. Select Pace and you are all set.
 
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