What3Words

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Skytriker
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What3Words

Post by Skytriker » Sat Aug 31, 2019 7:45 am

I have searched to check if this has been covered before but couldn’t see anything, so apologies if it has. My other hobby is cycling and I lead groups for British Cycling. I am always aware that I may have to summon emergency help in unfamiliar locations. Trying to pass on a grid reference in difficult circumstances could lead to inaccuracy and loss of vital time, so I was delighted to learn of https://what3words.com/about-us/. I won’t go into detail as you can follow the link, but I do believe this could be useful to we detectorists, for both location recording and safety. The only current issue is that not all emergency services use the system, so the more of us who sign up to the app, the more likely they will adopt it.

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Re: What3Words

Post by Oxgirl36 » Sat Aug 31, 2019 8:00 am

That’s an interesting idea ::g
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Re: What3Words

Post by bigjohnox » Sat Aug 31, 2019 8:17 am

I have the app - it is really useful for storing 'check that site in the future' areas as well. It is so accurate. With GPS app that give you accuracy in general terms (up to 30 metres) this is so precise. The app designer is a genius.
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Re: What3Words

Post by Skytriker » Sat Aug 31, 2019 8:23 am

This is the current list of emergency services already using it https://what3words.com/news/emergency/t ... -response/
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Re: What3Words

Post by Fusion » Sat Aug 31, 2019 9:09 am

W3W came up in November last year, when we were discussing the PAS records of finds and their locations. It turns out that PAS use W3W to record findspot .... except they didn't record the accurate location, just the south-east corner of the 1km grid-square containing the find. Which is bizarre : using a 3 metre accurate system to record something to 1000m accuracy.

I find it amusing that if you have deep pockets, you can buy a "what 1 word" reference.
Update: Apparently not any more. After selling many thousands of customers their 1-word, they've now stopped this 'feature'....
Last edited by Fusion on Wed Sep 11, 2019 11:41 pm, edited 2 times in total.

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Re: What3Words

Post by Skytriker » Sat Aug 31, 2019 9:17 am

I just checked my location with the app and it is two squares, 6m, away from my actual location. I checked it again and it had moved one square right, so not a pinpoint by any means. However, I see its use mainly for safety, and location within limitations.
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Re: What3Words

Post by Easylife » Sat Aug 31, 2019 10:39 am

Fusion wrote:
Sat Aug 31, 2019 9:09 am
It turns out that PAS use W3W to record findspot .... except they didn't record the accurate location, just the south-east corner of the 1km grid-square containing the find. Which is bizarre : using a 3 metre accurate system to record something to 1000m accuracy.
PAS use British Grid Reference to record find spots. BGR marks the South-west corner of the grid square. Grid square size is dependent upon the accuracy that it is recorded to which can be to less than 10sqm but is only publicly shown to 1000sqm on PAS for actual location security. ::g
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Re: What3Words

Post by Easylife » Sat Aug 31, 2019 10:45 am

Skytriker wrote:
Sat Aug 31, 2019 9:17 am
I just checked my location with the app and it is two squares, 6m, away from my actual location. I checked it again and it had moved one square right, so not a pinpoint by any means. However, I see its use mainly for safety, and location within limitations.
W3W app is only as accurate as your phone's GPS if using it. But by selecting location on the map is 100% spot on. ::g
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Re: What3Words

Post by Skytriker » Sat Aug 31, 2019 10:59 am

Easylife wrote:
Sat Aug 31, 2019 10:45 am
Skytriker wrote:
Sat Aug 31, 2019 9:17 am
I just checked my location with the app and it is two squares, 6m, away from my actual location. I checked it again and it had moved one square right, so not a pinpoint by any means. However, I see its use mainly for safety, and location within limitations.
W3W app is only as accurate as your phone's GPS if using it. But by selecting location on the map is 100% spot on. ::g
It certainly is. I use it to arrange meeting places. Much easier than a description and more localised than a postcode. I also like the fact that you don’t even need a data connection to obtain a location, when out and about ::g
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Re: What3Words

Post by Pete E » Sat Aug 31, 2019 11:11 am

Easylife wrote:
Sat Aug 31, 2019 10:45 am
Skytriker wrote:
Sat Aug 31, 2019 9:17 am
I just checked my location with the app and it is two squares, 6m, away from my actual location. I checked it again and it had moved one square right, so not a pinpoint by any means. However, I see its use mainly for safety, and location within limitations.
W3W app is only as accurate as your phone's GPS if using it. But by selecting location on the map is 100% spot on. ::g
It's a while since I used GPS seriously, and things have moved on...I notice now my phone GPS typically quotes an accuracy of 5m where as my handheld unit will go down to about 3m, but these are averages and are a radius measurement....that means my phone will typically put me in a 10m circle which will be correct something like 90% of the time.

As W3w uses your GPS location as a starting point, that's its base accuracy.

At my Club, somebody was trying to push the idea of using 10 figure grid refs generated by a phone app for recording finds as it was "accurate to 1m"....I gave up trying to explain it was a false and misleading premise.

Unfortunately my local emergency services don't use W3w, so I will continue to use a six figure grid for most things and only use eight figure where there is a real benefit such as recording finds.
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Re: What3Words

Post by Fusion » Sat Aug 31, 2019 11:30 am

Quote: "PAS use British Grid Reference to record find spots. BGR marks the South-west corner of the grid square. Grid square size is dependent upon the accuracy that it is recorded to which can be to less than 10sqm but is only publicly shown to 1000sqm on PAS for actual location security. "
Yes, this was all debated in your thread at the end of last year, remember?
For those who missed it:
viewtopic.php?f=10&t=107109
They record a findspot accurate to 10 metres, and also record it to the 1km square, the latter is what the public now sees.

I said they use W3W because they DO use W3W. Take this Thames foreshore find:
https://finds.org.uk/database/artefacts ... /id/773830
And the geojson record includes:

"fourFigure":"TQ3480"
"map25k":"TQ3480",
"map10k":"TQ38SW",
"fourFigureLat":"51.50305749",
"fourFigureLon":"-0.07075664",
"accuracy":"10",
"what3words":"video.glue.jumped",
"source":"Generated from computer mapping software",


Enter "video.glued.jumped" into a converter like Geocaching Toolbox:
https://www.geocachingtoolbox.com/index ... n&page=w3w
and it shows a location close to the Thames.
Or use W3W's site:
https://map.what3words.com/video.glued.jumped

Obviously many old PAS records don't use it, as it didn't exist then.

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Re: What3Words

Post by Easylife » Sat Aug 31, 2019 2:26 pm

Fusion wrote:
Sat Aug 31, 2019 11:30 am
Yes, this was all debated in your thread at the end of last year, remember?
I'll just say that there were many opinions and guesses from some ill informed people in that thread.
The lat/long & W3W are just computer generated by PAS from the 4 digit (1kmsq) grid refs and that is what you are seeing, that's my last comment on this as it's going off topic. ::g
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Re: What3Words

Post by Dangerous Norman » Sat Aug 31, 2019 3:03 pm

Easylife wrote:
Sat Aug 31, 2019 10:39 am
Fusion wrote:
Sat Aug 31, 2019 9:09 am
It turns out that PAS use W3W to record findspot .... except they didn't record the accurate location, just the south-east corner of the 1km grid-square containing the find. Which is bizarre : using a 3 metre accurate system to record something to 1000m accuracy.
PAS use British Grid Reference to record find spots. BGR marks the South-west corner of the grid square. Grid square size is dependent upon the accuracy that it is recorded to which can be to less than 10sqm but is only publicly shown to 1000sqm on PAS for actual location security. ::g
British Grid.Ref. is accurate to 1 mtr if you use the 10 digit ref. ie ZY12345 67890. 10 mtrs is 8 digit ie NZ1234 5678 or 100 mtrs if you use 6 digits ie NZ123 456. High quality GPS equipment can give a 12 digit ref. accurate to 10 cm. My dedicated GPS is typically accurate to 1 mtr but my phone with true GPS is typically 2.5 mtrs out. I have tested this fact several time using OS25k mapping software & Google earth. What3Words will show my location 1 grid square out which fits with the results of the accuracy tests I've carried out.

Not all phones use true GPS, many only use aGPS which isn't as accurate. Even GPS can be a long way out depending on weather, terrain etc. On a bad day 50 mtrs out is not unusual but on a good day it can be less than one mtr.

PAS prefer a minimum of 8 digits, would like 10. AFAIK they record whatever is submitted but only display a 4 digit ie NZ12 34 so the exact find location is not identified.

I always provide a 10 digit ref. but my recorded finds only show a 4 digit ref.

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1 meter grid squares web site.

Post by Mancave-man » Wed Sep 11, 2019 6:18 pm

This was posted by jcmaloney in the "Rallies" section and I think it is brilliant and good for us detectorists https://what3words.com/ so thought I would share it in case you haven't seen it yet. ::g

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Re: What3Words

Post by Fusion » Wed Sep 11, 2019 7:32 pm

Deleted.
Last edited by Fusion on Thu Sep 12, 2019 2:25 pm, edited 1 time in total.

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Re: 1 meter grid squares web site.

Post by Easylife » Wed Sep 11, 2019 11:12 pm

They are 3 metre grid squares. :D
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Re: What3Words

Post by Fusion » Wed Sep 11, 2019 11:44 pm

They describe the 'squares' near the north and south poles as "slightly squashed". Like a triangle, perhaps?
Last edited by Fusion on Thu Sep 12, 2019 2:27 pm, edited 1 time in total.

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Re: 1 meter grid squares web site.

Post by Easylife » Thu Sep 12, 2019 12:45 am

Maybe more like a trapezoid? x;
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Re: What3Words

Post by Polecat » Sat Nov 02, 2019 9:24 pm

Fusion wrote:
Sat Aug 31, 2019 11:30 am

Enter "video.glued.jumped" into a converter like Geocaching Toolbox:
https://www.geocachingtoolbox.com/index ... n&page=w3w
and it shows a location close to the Thames.
Or use W3W's site:
https://map.what3words.com/video.glued.jumped
Strangely this now points to the middle of the Brazilian rain forest x;

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Re: What3Words

Post by GeorgeMK » Sat Nov 02, 2019 9:37 pm

Polecat wrote:
Sat Nov 02, 2019 9:24 pm
Fusion wrote:
Sat Aug 31, 2019 11:30 am

Enter "video.glued.jumped" into a converter like Geocaching Toolbox:
https://www.geocachingtoolbox.com/index ... n&page=w3w
and it shows a location close to the Thames.
Or use W3W's site:
https://map.what3words.com/video.glued.jumped
Strangely this now points to the middle of the Brazilian rain forest x;
video.glue.jumped is in City Of London.
video.glued.jumped is in Brazil.

Spelling typos are going to give wrong locations.

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Re: What3Words

Post by Polecat » Sat Nov 02, 2019 9:55 pm

Well spotted, I didn't think to fiddle with the words.

W3W is pretty clever stuff though ::g

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Re: What3Words

Post by GeorgeMK » Sat Nov 02, 2019 11:15 pm

I think I might have to book a couple of holidays.

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