Australia Samantha Murphy, 51, last seen leaving her property to go for a run in the Canadian State Forest, Ballarat, 4 Feb 2024 *Arrest* #11

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australianwebsleuth said:
We can see the tower in the image. That is why I put it in. Have a look. You can tell.
Click to expand...

What I said was that I can't see it on Google street walk. I have tried. A satellite image doesn't show me the sectors.
Have you been able to pull it in on street walk?

I agree it is the one near Bird World, I am not looking at the tower on Mount Buninyong.
 
Lemony said:
In this news clip the reporter says the property owners were approached by police in the weeks after Samantha went missing, warning them that the area would be searched.

Click to expand...
The police came to the dam property just weeks after Sam disappeared? That’s really early on in the scheme of things. Did the police search all dams and properties within the 5km radius?

“The home owners told Nine News that they were approached by police just weeks after and Ms Murphy’s disappearance.”
“Warned the area would be searched considering the dam is just 5km away from the phone tower that triggered her last ping”.
 
JLZ said:
Could the phone have been triangulated once the water receded?
Click to expand...

Not if it was off. And if it did happen to be on at the time of chucking it in the dam, the water likely killed it within 30 minutes. If you do a bit of a google, you will see blogs and Apple discussions groups that say the IP67-rated iPhone can last 30 minutes submerged. They are classed as water-resistant.

imo
 
JLZ said:
Isn't it more likely they could tell the direction than the distance?
Click to expand...

From other cases i have followed they can use something called timing advance to get an azimuth and an approximate distance from the tower. Timing advance is basically a way that the tower calculates the return time/distance for the radio signal to the phone.

This can be used with other intel and insights and experiences. For instance if you look in the arc, and discover there is a location where evidence might be dumped - then that is a good place to look....
 
SouthAussie said:
They can tell which sector the phone pinged on, on a single tower. Which gives them a general direction. It is not one gigantic circle.
They just can't triangulate from one tower, or two (although two is better than one, and not as good as three or more). And the sector is rather large.

I have posted this link several times now. I think it is one of the easiest explanations for a layperson to understand.



Here is how a single mobile network tower would work.

The mobile tower can determine that the signal is being received from the γ sector, and that the source of the signal is close to 8 km from the mobile tower.

The mobile tower is then able to locate the source of the signal, placing the device within the yellow band which is around 16km long and .25km wide for a total of around 4km².

Within each sector, the tower can determine the distance of the transmitting device. This is done by measuring the strength of the signal and the time in which it takes for the signal to hit the destination and return.

View attachment 529531
www.gpyes.com.au

Cell Tower Triangulation - GPYes Tracking Solutions

Cell Tower Triangulation is a technique used widely by mobile network operators, devices and phones to help identify their location. A device that is within communication range of three or more mobile network towers is located by the overlap of signals based upon its range from each tower.The...
www.gpyes.com.au www.gpyes.com.au
Click to expand...

yes exactly this.

So then you look at what is in those sectors - e.g road access, structures, potential dumping sites etc
 
This is another case I followed ages ago, that has a really good visual description of cell tower data tracking , it is a few years old ...


Start about 3 hrs 48 mins in.

WARNING it is a very graphic case
 
drsleuth said:
I don't think it was a complete co-incidence. I think they had some intel, but didn't know exactly which dam, but knew the general area.

IMO
Click to expand...

Agreed - this sort of thing has happened in many other cases and reveals how often backbreaking leg work is needed (plus a bit of luck). How many times do we see reservoirs etc searched with divers because insights have identified a number of potential dumping sites. And many times, these insights pan out - frequently because perps tend not to go far for disposal.
 
You wonder how did police suddenly arrive at this location? Where were all the failed attempts at other properties along this road, or other roads? Did they just get lucky? Or was it staged?
But we know Samantha's phone has been found within range of the Buninyong tower, so it's consistent with the
(possibly unconfirmed) 5pm ping.

Pings to cell towers from devices without SIMs contain very little useful data.

But still doesn't prove definitively that Samantha or her phone was in that location at that time, including the accused, we still don't know where her watch is, but again if she had a cellular Apple Watch there would have been no need for her to take her phone.

It was said that Samantha's device pinged a cell tower. This requires either her phone, with or without a Sim card to be active OR a cellular-connected Apple watch

Even if the phone pinged at 5pm, it may have been in the dam earlier.
Or the phone may have pinged at 5pm but been put in the dam on a different day altogether.

I find it very strange that clearly who ever disposed of Samantha's phone wanted to dispose of the whole contents of the phone wallet, including her ID

Is there a connection with that dam ? And who ever put it there thought it would never be searched ?

But we don't know for sure it was the accused who put the phone in the dam.
 
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