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Author Topic: instant pace in gh-625xt  (Read 7974 times)

gerhard

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Re: instant pace in gh-625xt
« Reply #15 on: May 08, 2012, 03:35:31 pm »

Suggestion: Use pace since last lap and instant pace and your instinct together to adjust to correct pace.

+/- 5 sec/km is extremely narrow also with good GPS reception. Good accuracy is about 5m. Open fields and clear sky may give you down to 3m, a wood trail in rain maybe 8m, city canyon infinite. The accuracy is a mediate number, average is even higher. The error is not completely random. Back/forward errors will not affect distance, but left/right. For pace all errors affect though. With every second averaging, the speed could differ as much as -5 m in one point and +5 in next, which may give 0 speed in one point and 2 min/km in next. This is why the device uses smoothing to present pace. Since many users have a different opinion on "correctness" vs responsiveness, user option is a good thing.
(and the 625XT GPS is better than most.)
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WincenT

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Re: instant pace in gh-625xt
« Reply #16 on: May 11, 2012, 02:23:52 am »

Thank you all for your experiences/clarifications, which have helped me to understand that the problem is native in the GPStechnology and perhaps we can not expect much more in terms of GPS accuracy. I agree that user should be able to choose the level of smoothing which is closest to his liking, and as has already been mentioned by partyman66 would be nice to implement this option in the next firmware. ;D
I appreciated the tips about buying but I'm planning on using ebay that I normally use which gives me more reliability and security.
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WincenT

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Re: instant pace in gh-625xt
« Reply #17 on: May 16, 2012, 04:03:48 am »

I bought it from dtechglobal on ebay. I hope it will come soon. ;D
« Last Edit: May 16, 2012, 05:02:23 am by WincenT »
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partyman66

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Re: instant pace in gh-625xt
« Reply #18 on: May 16, 2012, 11:59:29 am »

I bought mine from them too.  Shipped really fast, even though it came from Israel.

The only problem is that they are not an officially licensed reseller, so you can't get warranty repair/replacements on a watch bought through them.
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canadien

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Re: instant pace in gh-625xt
« Reply #19 on: May 16, 2012, 01:37:01 pm »

I bought mine from them too.  Shipped really fast, even though it came from Israel.

The only problem is that they are not an officially licensed reseller, so you can't get warranty repair/replacements on a watch bought through them.
Have you tried to contacted him?

He said on his auction pages he is giving one year waranty. This is the first step you should go through.

Quote
Warranty and repairs
All products are covered by full 12 months warranty from DTech.
Warranty cards are included within product box.
« Last Edit: May 16, 2012, 02:26:38 pm by canadien »
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GS_TECH01

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Re: instant pace in gh-625xt
« Reply #20 on: May 16, 2012, 02:53:38 pm »

Hello WincenT,

I know it's a bit late, but, welcome to the forum!

Also, I hope you're enjoying your stay here and having a good discussion with our informed forum members. 

If you have any firmware wishes for the GH-625XT, feel free to post here: http://www.usglobalsat.com/forum/index.php?topic=4136.0. Moreover, if you have any software modification requests, you can initiate a topic here: http://www.usglobalsat.com/forum/index.php?board=124.0
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WincenT

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Re: instant pace in gh-625xt
« Reply #21 on: May 17, 2012, 05:13:47 am »

Thanks to all. :)

from dtechglobal (on ebay site)
Quote from: dtechglobal (on ebay site)
Buy with confidence !!

    Don’t take any chances. Buy your GlobalSat products directly from DTech – a first tier distributor.
    all our products are brand new with latest edition firmware or software.
    Warranty – we provide 12 months warranty for all our products.
    We do not hide behind vague statements like “one year manufacturer” warranty that send the customer to deal directly with the manufacturers. We are standing behind the quality of our products and provide a direct warranty, repair and replacement service by us.

    14 Days Money back warranty – If by any reason you are not pleased with the items purchased, you can return it to us in it’s original packaging within 14 Days from receiving the item. We will credit you PayPal account back immediately when we receive the product back. Please note that shipping cost from us and back to us is not refounded.     

Warranty and repairs
All products are covered by full 12 months warranty from DTech.
Warranty cards are included within product box.

So I think he's ok.  :)
Also before buying, I asked about the warranty, and the answer was: "there is no agent for Globalsat in Italy. If you have a problem / need warranty - you need to send it back to us in Israel or Taiwan for repair or replace. "
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WincenT

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Re: instant pace in gh-625xt
« Reply #22 on: June 01, 2012, 05:26:03 am »

Just arrived after 17 days. I'm going to try it. ;D
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GS_TECH01

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Re: instant pace in gh-625xt
« Reply #23 on: June 01, 2012, 11:49:45 am »

Thanks for the update!  :)

Please share your findings with the rest of us. Looking forward to hear from you.
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WincenT

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Re: instant pace in gh-625xt
« Reply #24 on: June 14, 2012, 04:15:29 am »

'Pace' and 'Speed' are not the same thing!
Is an oddity of my unit or is a conscious choice?
The speed showing in km/h seems to be an average of last 8-10 seconds and is fairly satisfactory, while the 'Pace' showing in min/km seems to be the result of an average of indefinite and much longer interval. I often run on routes where there are alternating ascending descending and flat sections, so in this kind of trails the "pace" is not useful to me.
It would be useful to have also a real "instant pace" or be able to choose in which way the speed is expressed (km/h or min/km).
« Last Edit: June 14, 2012, 04:21:32 am by WincenT »
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canadien

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Re: instant pace in gh-625xt
« Reply #25 on: June 14, 2012, 04:58:28 am »

Interesting! Unlike most runners I've always used speed instead of pace and always been satisfied with it. Will check your statement in my next run.
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Longjog @ GS-Sport-Servicecenter

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Re: instant pace in gh-625xt
« Reply #26 on: June 14, 2012, 06:39:50 am »

It would be useful to have also a real "instant pace" or be able to choose in which way the speed is expressed (km/h or min/km).
Hi,
the Pace-discussion is one of the first features we discussed just when GH-615 was the actual model.
The problem is the acuracy of GPS. Especially when speeds are slow (like 10 or 12  km/h) there are big errors if the speed is calculated from two geographical points which are aquired within some seconds. These two points will be near together if the real speed is slow. Every point will have an absolute error up to 10 m caused by the GPS-accuracy.
There was the idea to calculate the Pace from the actual last 1000 m (called Pace1K-discussion) but at the end the GS-engineers managed to get a relative reliable value for pace, if the last 600 m were talken for pace-calgulation.
Instant-Pace as function 1/Speed would work, if you run speeds around 20 km/h = 3min/km.

Try the following: Ride your bike with constant 15/20/25 km measured by bycile-computer and watch the speed which is shown by the Gps-watch. GPS-watch will jump in a range which is larger, the slower you ride.
Certainly It would be fine to find a solution which eleminates the error caused by GPS-error at lower speeds but this would cost sensivity
Best regards

Longjog
« Last Edit: June 14, 2012, 06:41:28 am by Longjog @ GS-Sport-Servicecenter »
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WincenT

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Re: instant pace in gh-625xt
« Reply #27 on: June 14, 2012, 09:41:42 am »

Yes, but speed is certainly calculated by averaging over a shorter interval than 600m and I'm already quite satisfied with the "Speed" given by the watch, even at speeds lower than 20km/h. It would be nice to have a chance to see it also in "min*km" mode.
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canadien

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Re: instant pace in gh-625xt
« Reply #28 on: June 14, 2012, 05:15:47 pm »

Wow just made a test and am astonished how pace is so slow reactive. Looks more like an average than a real pace. Another reason for me to prefer speed over pace. I suppose it is specifically made for running and "speed" for faster activity, but Geoffrey once wrote that they removed errors tampon calculation that was on sirfstar3 devices because of sirstar4 precision. So i wonder why it is that much slow reactive.

Anyhow I would like to see the algorithm of both cause right now it seem that Wincent's request is totally valuable.

« Last Edit: June 14, 2012, 05:50:06 pm by canadien »
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WincenT

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Re: instant pace in gh-625xt
« Reply #29 on: June 15, 2012, 05:01:53 am »

Do you think it would be feasible and satisfactory planning of workouts based on repeated intervals, alternating several times eg. 2km at a fast pace, and 1km at a slow pace, possibly by setting alarms when exceeding or coming off of 10 sec/km? :D
or better 5 sec/km? ;D ;D
Suggestion: Use pace since last lap and instant pace and your instinct together to adjust to correct pace.

+/- 5 sec/km is extremely narrow also with good GPS reception. Good accuracy is about 5m. Open fields and clear sky may give you down to 3m, a wood trail in rain maybe 8m, city canyon infinite. The accuracy is a mediate number, average is even higher. The error is not completely random. Back/forward errors will not affect distance, but left/right. For pace all errors affect though. With every second averaging, the speed could differ as much as -5 m in one point and +5 in next, which may give 0 speed in one point and 2 min/km in next. This is why the device uses smoothing to present pace. Since many users have a different opinion on "correctness" vs responsiveness, user option is a good thing.
(and the 625XT GPS is better than most.)

It seems impossible to create workout as when I asked info a few posts above.
In the section: GYM> INTERVAL TRAINING> CREATE WORKOUT you can only create time-based intervals (RUN-TIME), or distance-based intervals (RUN-DIST), without regard of the speed to maintain, so it is impossible even set alarms when you are out of Pace/Speed range.
Instead in (HEARTRATE) interval, you can set both the pulse-range and the time so the alarm occurs properly when you exit from the pulse-range.
I wonder if the lack of functionality is also due to the aforementioned lack of sensitivity in the detection of the instantaneous speed.

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