|
Mar 2022
11:06am, 4 Mar 2022
13,525 posts
|
chunkywizard
Hi RB, I had one (now upgrade to a 945), it's a very good watch. You can vary the display to show 1, 2 or 4 metrics at once. With just one then the font is pretty big. All you have the ability to load CIQ datafields which are user created and so it is possible to get even bigger type if you want it.
As for the feedback on training, this can be turned off if you don't like it.
I've seen the 645 on sale in a few placed, it's a very good price for a very good watch. It also has things like payment on which are really useful and easy to set up.
|
|
Mar 2022
11:12am, 4 Mar 2022
17,219 posts
|
larkim
I've got one, had it about 9 months now. At the price at the moment at about £180 I think it's great value.
Things I like:-
- battery lasts plenty long enough
- interface is nice
- music is good to have (though I've not used it more than a couple of times)
- contactless payment is great
- breadcrumb navigation and routes are perfectly fine to use
- size and weight are good
- *for me* the optical HR is as a good as a chest strap or independent HRM
- no touch screen makes it nice and easy to use and avoids false taps
- GPS is accurate enough
- £180 is a bargain
- loading workouts to it is simple
- sleep tracking seems to work fine
Things I know I've missed out on by not going down the 245 route
- 400m track features (though I'd use them rarely)
- newer body battery metrics etc
- better VO2Max esimation and predictions
Things I wish I could change:-
- The GPS is just not quite as neat and tidy as my old Vivoactive (first model) was. It shouldn't have been the case really, but my VA would be almost 100% spot on with 400m track laps and being consistent on specific loops that I use for intervals. I think it may have been because it actually recorded very few data points, but my watch (and a couple of other VAs that are in the family) I would definitely trust 3-5% more to be spot on accurate for looped courses. This could be entirely anecdote, and I really have no issues with the GPS on the 645 (i.e. I don't do races and find that it measures completely differently to everyone else) but the VA had "something".
- very occasionally it is slow to respond to a lap button being pressed (I'm talking 1-2s delay before it beeps). Very occasionally though, by no means regular.
- barometric altimeter sometimes records jaggedy logs of up/down/up/down every few metres, so whilst the overall height is about right it accumulates more "climb" to a run than it should. I don't really pay much attention to elevation data though so it's not a great issue.
- I don't love the clip charger, but it is what it is and works fine
In an ideal world I'd have £1000 to shell out on the latest and greatest Fenix, but for me the 645M is just about spot on, with the reservations above being minor quibbles rather than fundamental flaws.
|
|
Mar 2022
11:27am, 4 Mar 2022
13,528 posts
|
chunkywizard
by the way I use the music capabilities all the time for audiobooks and love it! It's also great for workouts as you get audio prompts (I think that's on the 645, it definitely is on the 945!)
|
|
Mar 2022
1:00pm, 4 Mar 2022
36,378 posts
|
SPR
"better VO2Max esimation" did estimation change on the newer watches? Never been able to verify that. I thought it was just the prediction which used training load alongside VO2 Max.
|
|
Mar 2022
1:06pm, 4 Mar 2022
17,220 posts
|
larkim
Yes, that's what I meant - the prediction algorithm is different and more precise.
Would be reassuring to know that the algorithm for estimating VO2Max is the same across different watches (I know there are mild differences in implementation e.g. VO2Max from trail activities which presumably requires a subtly different algorithm to extract reliable inputs / outputs).
|
|
Mar 2022
4:18pm, 4 Mar 2022
14,105 posts
|
Homer
My Fenix 7 decided my Vo2Max had gone up a bit overnight, ok only from 51 to 52 but still, must be a different algorithm
|
|
Mar 2022
4:21pm, 4 Mar 2022
17,231 posts
|
larkim
Overnight? I thought it could only go up via a training activity?
|
|
Mar 2022
4:23pm, 4 Mar 2022
1,080 posts
|
Bowman 🇸🇪
Yes, i think mine did that as well a while ago. I got a number after the workout, but later that day I got one higher. Thought I must have seen wrong. But maybe not then?
|
|
Mar 2022
4:40pm, 4 Mar 2022
36,380 posts
|
SPR
It's only supposed to go up by activity. I have seen times when the displayed VO2 Max doesn't match the rounding when you look on Runalyze.
Maybe there was some activity overnight that registered as training based on HR, lol.
|
|
Mar 2022
4:45pm, 4 Mar 2022
17,232 posts
|
larkim
Snigger 
|
