Forums > Windsurfing   Gps and Speed talk

decrepit
WA, 7191 posts
Sunday, 19 Feb 2017 19:47
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ka43 said..
>>> I know the gurus will poo poo my comments but it just seems the "great fix" we were all waiting for isn't really happening. >>>



No mate, a watch was never the favourite option, it's got smaller everything, antenna, memory and battery.
And the wrist is not an ideal place for GPS accuracy.

But I assume the marketing gurus decided that what would sell the best is the watch.
I'm sure this is a marketing decision, not a technical one.
As so often happens, it may sell more units, but it's not ideal for the purpose.

So basically the fault is down to consumers who listen too much to marketing hype and follow fashion for fashions sake. If everybody considered best for purpose before buying, the marketing guys wouldn't have so much say.

jn1
SA, 1231 posts
Sunday, 19 Feb 2017 22:32
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decrepit said..


For a start I'm almost certain it's always passive, the only way it can transmit anything is via usb cable.

You can select time zone in the setup, so UTC shouldn't be a problem either, I'm not sure about the 1sec accuracy all the time.
When the unit is first turned on it needs to sync to satellites before the time display comes up, so it would be accurate then, but I've no idea how often it resyncs, and if the accuracy could drift to more than 1sec


Hi Decrepit, thanks for info. I only need UTC time (but interesting to know it can do local time)

Does the time display HH:MM:SS, or does it display HH:MM ?

Once the unit has GPS lock, can the time freewheel if it loses GPS lock ? (ie: I go outside and get GPS lock. I then go into building - with no GPS signal - and still have watch count UTC time).

J

decrepit
WA, 7191 posts
Sunday, 19 Feb 2017 20:41
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Time display. hh:mm:ss
That was my point, about accuracy, I've no idea how often it checks the sat time. Once it's synced on initial start up it seems to just run as a watch, GPS signal or not.
Woops revise that, I've just turned it on after several days off and its about 1hr 30min fast. After it's synced it agrees to the second with this computer.

If I could remember just how long it's been off, we could work out how long it would take to be over a second fast, hmm probably not long at all maybe two days. So if it isn't checking the GPS signal regularly it gains 1.5hrs in 48, or 1hr in 32 or 112sec in an hour? That seems like a lot, am I doing this right?

sailquik
VIC, 3237 posts
Sunday, 20 Feb 2017 00:03
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I am not sure it's a given that satellite time and UTC time will always be exactly the same........

I am pretty sure a good timepiece watch will probably hold sub second accuracy, once set, for quite some time.

John340
QLD, 1435 posts
Monday, 20 Feb 2017 08:23
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PaulvN said..
Hi All, I am just an amature Windsurfer and I wan't to give my Son a GW 60 for his birthday( he is going to do the Slalom races in Holland)

I see a lot of questions and solutions in this group.

I've got a simple question: Do you advice to buy the GW60? or should I wait


If he does GPS sailing and wants to post results on either GPSTC or GPS-SS, then the GW60 is the go. Its waterproof, accurate, easy to use. In addition, with the coming new firmware, that is currently being tested, it has some great new functionality.

If he does Slalom racing then the GW60 will also be really good to measure and compare straight line and gybe speed during training sessions. He will still need a separate timing watch for race starts. The timer on the GW60 does not have good enough visual and sound feedback to nail a slalom start

decrepit
WA, 7191 posts
Monday, 20 Feb 2017 15:49
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jn1,
Further back on this thread, your very subject came up, about page 9 I think.

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A completely different GW60 Topic: Watch time accuracy?

My understanding is that the 'clock' feature obtains its' time from the GPS, according to the instructions.

Someone please explain to me why I have a GW60 and a GW52 that were both used today obtaining GPS speed data and yet their clock times are different by 2 seconds! I would think that every time the unit connects to the GPS satellites that it would re-sync, no?

Not really a big deal since I don't use either as a 'time piece', but was surprised to see this.

decrepit
WA, 7191 posts
Monday, 20 Feb 2017 16:00
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decrepit said..

ka43 said..
>>> I know the gurus will poo poo my comments but it just seems the "great fix" we were all waiting for isn't really happening. >>>




No mate, a watch was never the favourite option, it's got smaller everything, antenna, memory and battery.
And the wrist is not an ideal place for GPS accuracy.

But I assume the marketing gurus decided that what would sell the best is the watch.
I'm sure this is a marketing decision, not a technical one.
As so often happens, it may sell more units, but it's not ideal for the purpose.

So basically the fault is down to consumers who listen too much to marketing hype and follow fashion for fashions sake. If everybody considered best for purpose before buying, the marketing guys wouldn't have so much say.


Woops, maybe the physical memory size is smaller, but the watch has much more capacity, probably a few days at 5hz.

John340
QLD, 1435 posts
Today, 23 Feb 2017 07:26
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I did a 100km with the watch yesterday. It had about 1/4 of bar of battery life left at the end. 100km is more than enough for me. My inner battery will run out before the watches battery.

decrepit
WA, 7191 posts
Today, 23 Feb 2017 11:42
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Beat you John, I did 120km on Tuesday, but I charged the unit up over lunch and board change. I had 2 bars left when I came in.
But it was far from a good distance day I was on the water for about 8 hrs, enough time to do well over 200kms.

John340
QLD, 1435 posts
Today, 23 Feb 2017 13:47
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Does this mean my internal battery will get better as I get older. Your a champion Mike. I was ready to go in at 78kms, but I thought I'd might as well bring up my century. I didn't really enjoy it.

decrepit
WA, 7191 posts
7 hours ago, 23 Feb 2017 12:07
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John340 said..
Does this mean my internal battery will get better as I get older. Your a champion Mike. I was ready to go in at 78kms, but I thought I'd might as well bring up my century. I didn't really enjoy it.


Probably not, I think conditions have a lot to do with it. Go to Lake George when it's really on, you'll be surprised at how far you can go. Flat water steady wind.
Although I say it wasn't a good distance day, that's because I'm useless in chop, and the 2km run had the boat channel in the middle which was choppy. So I stayed on one side most of the time and just did 600m speed runs, in flat water.

Kazza
TAS, 2028 posts
7 hours ago, 23 Feb 2017 15:39
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I think on distance days I'll carry my GT31 as well and just use the GW60 when going for a casual sail with no PB's in mind.



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Forums > Windsurfing   Gps and Speed talk


"Locosys GW-60" started by sailquik