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Is anyone loving their 645?

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  • #16
    Originally posted by KeithTrivett View Post

    I dont get any problem with elevation either, I dont get any steps like one other person has said , which again is an indication of a GPS antenna issue as the elevation would re calibrate when it looses GPS .
    Interesting... maybe this is what is causing my lap pace and elevation gain to be way off. In all honestly, if every 645 sold performed like my watch does, everyone would send their 645 back and Garmin would probably go bust. At the moment I can't even use it to pace my runs as the live data is meaningless, apart from the final distance.

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    • #17
      Here are just two examples of just how bad my 645 performs compared to the 935 from my 10 mile run last night, wearing both of them. Oddly, the total distance and average pace is the same, but the pace graphs show a lot of discrepancies, and there is a 100m difference in elevation gain! Yes, I waited over a minute to get a proper satellite fix, and both watches are running latest software with Galileo and 1 second recording enabled.

      https://connect.garmin.com/modern/activity/3079849479

      https://connect.garmin.com/modern/activity/3080043689

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      • #18
        I do like the watch as well, non music 645 in my case. It has a few foibles that may or may not get fixed by Garmin eventually but overall I'm happy with it. Didn't buy the music version although I was tempted as I've worked in IT long enough to know never get the first version of anything & all the reports of reboots etc with music make me think I made the right decision.

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        • #19
          Originally posted by scotthunter2 View Post
          Here are just two examples of just how bad my 645 performs compared to the 935 from my 10 mile run last night
          I can't really tell the problems (with pace) by just looking at your activities. My problem is with lap pace during the run, and laps that are marked incorrectly. When you wore the two, did they lap close enough with one another (Say up to 10m)?

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          • #20
            Originally posted by talsela View Post

            I can't really tell the problems (with pace) by just looking at your activities. My problem is with lap pace during the run, and laps that are marked incorrectly. When you wore the two, did they lap close enough with one another (Say up to 10m)?
            The laps occur at more or less the same time, but it's the readouts of the pace and lap pace which don't match up with what is actually happening, or at least they don't match what the 935 says (which seems correct). Looking at the GPS tracks, the 645 doesn't perform too badly, so I don't know what is causing the pace info to be so wrong.

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            • #21
              In my case the readout of lap pace is all over the place so I'm with you on that. I've stopped using pace a long time ago when it became apparent to me that it's unreliable. That's why I'm lamenting the loss of lap pace now. The traces of my runs are also quite considerably inferior to comparable runs on the 630 though, which you don't seem to experience. But when tracing does seem stable (looking at it live during the run) - I still get erratic lap pace changes, so I can't quite explain that.

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              • #22
                On thing to keep in mind with threads like this or the forum in general, is in many cases people that are not having problems are less likely to look at the forums and post.
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                • #23
                  I've had about every level of the Forerunner line of watches over the last 5-6 years (FR10, 220, 235, & 735) and even the pinnacle, at the time, Garmin watch the Fenix 3. I have the non-music version of the 645 but my opinion is that it's the best Garmin watch I've owned.

                  It performs as a sports watch as well, if not better, than best I've owned before when it comes to GPS. They did make some strange decisions with altimeter calibration which has been addressed to an extent, there's still room for improvement, but it performs in this capacity better than the Fenix 3 did. (Seriously, you should go over to that forum and look at the altimeter thread there)

                  Battery life is very good, it's not plainly obvious to the whole world that you're wearing a sports watch when out-and-about, and it doesn't look ridiculously big on my skinny monkey arms.

                  Between running and cycling, I log anywhere from 7-13 hours of training a week and I have no complaints. The only thing I wish it had is power for cycling but I knew that wasn't a feature when I bought it and there's a CIQ app that allows me to capture power on the 645 so the watch has the ability to overcome this shortfall anyway.

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                  • #24
                    I bought this watch for 3 reasons: its size, the music, the functions.

                    I had a used TomTom Runner 3 that I had paid $70 for. It worked perfectly, with a HR belt (I don't trust the HR wrist measurement, on any watch). The fact that I had the music was perfect for me, just a few functions were missing: being able to display several information at the same time during the race (Pace, distance, HR).
                    I also wanted to be able to install applications on the watch, to feel that it could evolve.

                    At the end of 2017, the watches Polar, Garmin and Suunto did not have the music and was much too big. I want a discreet watch.

                    In short, when the 645 arrived, it was the perfect match: function, size, music.

                    This is my first Garmin, but I am a Geek and I love running using all the functions possible. I run 3 to 4x per week, about 45km per week.

                    I have no particular problem with PACE and GPS in open terrain. I had problems at first, when I changed the music track, the watch would crash. It was awful... No more problems on this point now.

                    Concerning the accuracy of the GPS, I had read on a forum (5K Runner or DC Rainmaker) that the accuracy depends on the size of the GPS antenna
                    And that the GPS antenna takes the maximum of the watch's size. So the smaller a watch is, the more inaccurate the GPS is. So you would have to compare the performance of a Fenix 5S or a watch of comparable size to get an idea. Comparing the accuracy of the 645 with a 630 or 935 is inadequate, these watches are larger.

                    For my part, since I don't want a large watch, the compromise on GPS reception quality suits me very well.

                    Concerning the PACE, in open ground no problem. In the forest it's so so... I now have a Stryd Footpod, so I no longer use GPS to provide me with PACE. However, I want to have the GPS to track my run and have a follow-up on Strava.

                    Concerning the HR sensor on the wrist, I only use it for resting HR. But I decided to disable it yesterday because I don't like the idea of getting my skin flashed 24/7.

                    In fact, the Tomtom took a measurement every 15 minutes and that was very good for me. I wish I could have that choice on the Garmin.

                    I rarely use the payment function, although I thought it was cool. In fact, at the store I almost always present my loyalty card and I must therefore have my wallet anyway. The function could be useful to me in case I forget my wallet.

                    I installed deezer, which I had been waiting for months... I uninstall it 2 days later. The synchronization is far too long, and the 500MB limit is inadequate. And I have no added value (No Playlist based on BPM for example). In short, I convert youtube music videos to MP3 and upload them on my watch. Good Old school.

                    I use my watch for hiking too, the altimeter works well (I live in Switzerland). I also use my watch to track my gainage/muscular strengthening and stretching sessions. To remember that I made some: -)

                    In practice I have not installed any apps, except for the DIY data field, which I use for running.

                    As I said earlier, I'm now using Stryd, and it's just perfect as a complement. Pace is very precise. We can take the Stryd Live version at $99 if we are not interested in the power indication. It's expensive, but then we have an ultra-precise combo. I like datas, and more, I like precisions.

                    In fact, I sometimes wonder about the usefulness of all the on-board sensors. For intervals and in general the HR sensor on the wrist is not adequate. For PACE, if you really want to be able to train precisely, a footpod is recommended. In short, for a Hobby runner, the watch is ok, for a runner who likes precision, the watch will not be precise anyway, whatever it is.

                    to sum it up, I like my 645m watch.

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                    • #25
                      Originally posted by talsela View Post
                      In my case the readout of lap pace is all over the place so I'm with you on that. I've stopped using pace a long time ago when it became apparent to me that it's unreliable. That's why I'm lamenting the loss of lap pace now. The traces of my runs are also quite considerably inferior to comparable runs on the 630 though, which you don't seem to experience. But when tracing does seem stable (looking at it live during the run) - I still get erratic lap pace changes, so I can't quite explain that.
                      I agree that as a running aid, the 645 is useless, as all runners really want to know during a run is their lap pace, which this doesn't. Which is funny as there are several older and much cheaper Garmin watches that significantly outperform this one in that respect.

                      As a watch for uploading their runs to Strava and for 24/7 wear, provided you don't mind your elevation gain to be + or - about 100m of what it actually was, it does the job just fine.

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                      • #26
                        Originally posted by tercier View Post
                        I bought this watch for 3 reasons: its size, the music, the functions.

                        Concerning the accuracy of the GPS, I had read on a forum (5K Runner or DC Rainmaker) that the accuracy depends on the size of the GPS antenna
                        And that the GPS antenna takes the maximum of the watch's size. So the smaller a watch is, the more inaccurate the GPS is. So you would have to compare the performance of a Fenix 5S or a watch of comparable size to get an idea. Comparing the accuracy of the 645 with a 630 or 935 is inadequate, these watches are larger.
                        I am not sure I believe that. The F235 and F630 are both small watches like the 645 and their GPS outperforms the 645. Could it be because those watches are entirely plastic and the 645 is part plastic part metal? I know this was an issue with the Fenix line...

                        Good idea about using a footpod. I have a Garmin Footpod and might start using it on my outdoor runs for accurate pace.

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                        • #27
                          I've never had a 630 but I did have a 235 and can't say that in my experience that it's GPS was any better than what I see with the 645. I get my auto-lap alerts within steps of where I normally get them on my usual routes and get the same total miles when running the same routes over and over.

                          The Garmin foot pod is really only useful at the pace you use when you calibrate it. Running a steady pace on the treadmill it's okay but if you go much faster or slower than the pace it's calibrated to it can get quite off.

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                          • #28
                            So far this watch has been fantastic - running functions, Garmin Pay and music are awesome and everything works well. Just need Spotify now.

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                            • #29
                              Apart on the buddy software (altimeter/elevation issue still not fix), I am pretty happy with the watch. No need for me to carry my phone during the runs.
                              Still hope the battery life can be improved further.

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                              • #30
                                I upgraded to this watch from the Vivoactive HR, having previously used the Forerunner 910xt (which I actually still use on triathlon race days for the multisport activity type).

                                I really like the watch. I got it for the music and some of the recovery metrics, and I've been very happy with it. Remember that people are more incentivised to talk about the issues that they've had than that they like it on forums like this. I actually find the GPS to be very accurate, and since the Galileo update it's even more so. I've got a route that I've been running regularly with it, and the distances are absolutely spot on every time, and when I look at the track, since the last GPS update, it sticks me right on the sidewalk for probably 90% of it (up from maybe 80%) with some deviations in to the road that I'm running next to.

                                That seems pretty accurate to me. I never used a 630, so maybe it was even better, but this one has been very consistent, and very accurate for me. And the music onboard (the feature that sold me, had me on the pre-order list) has been awesome. So yeah, I'm loving my 645. It's not perfect, but I haven't had most of the issues that others have had.

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