Mobile phones and sat-nav's

Questions or advice on GPS, mapping software, CB's, Sat phones etc

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Grommet1
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Re: Mobile phones and sat-nav's

Postby Grommet1 » Wed Mar 11, 2020 9:00 pm

I wonder if the guy was referring to the difference in accuracy between military gps and 'domestic'
I wasn't there so am just guessing from what's been said.
A boss of mine years ago had a trimaran he used to do the 3 peaks race with. He got a marine to do the running. He also got a military gps to map out the route at low tide prior to the race. He explained that it was more accurate so they could get in at low tide without grounding thus giving an advantage. Aside from the fact that he was cheating, this reminded me of that discussion.
Whether there is still a difference I don't know.

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Brian-reynolds
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Re: Mobile phones and sat-nav's

Postby Brian-reynolds » Wed Mar 11, 2020 10:13 pm

No, that was not it... there are more accurate units in the forces, I think quite a few of them, but that is not what I am referring to......

Good one though....

crinklystarfish
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Re: Mobile phones and sat-nav's

Postby crinklystarfish » Thu Mar 12, 2020 7:34 am

I've done a bit more reading and it seems that some smartphones actually have superior gps-receiving hardware to that of some dedicated satnav units. Quite a few phones reportedly have mobile chipsets that are capable of using the the GPS and GLONASS satellite networks.

Plus, if it's to be believed, some phones actually support full access to three satellite systems:

"... the high-end chip – Exynos 7880 – supports GPS, GLONASS and BeiDou."

The only difference in phone-v-satnav gps function would seem to be that phones have the added 'advantage' of being able to use AGPS in areas with good cell network coverage.

Further background here:

https://www.androidcentral.com/more-acc ... martphones

I'm still reading and pondering but am starting to come down on the side of doing away with a dedicated satnav after all.

You'd have to think that the bloke that ran the seminar knew his onions but for some reason the message he was putting over led to confusion.

Ivan C
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Re: Mobile phones and sat-nav's

Postby Ivan C » Thu Mar 12, 2020 9:56 am

This is a very interesting, and for me educational discussion.
However, beyond what point is increasing accuracy etc, for our purposes, largely unimportant?
I'm sure the newer devices have other benefits, but again, once you pass "fit for purpose" what's the point?
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crinklystarfish
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Re: Mobile phones and sat-nav's

Postby crinklystarfish » Thu Mar 12, 2020 6:26 pm

Speed of connection is a bonus. If you're in a tunnel or lose some satellites in a city for example, the more satellites the unit can speedily 'find', the more likely it is to quickly get back in the game. A second or two in these circumstances could be the difference in missing a turnoff or not.

Also, if one satellite system owner gets tetchy and decreases functionality then at least if the unit can utilise alternative networks, that might potentially be helpful.

Minor pluses but better to have them than not.

Ivan C
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Re: Mobile phones and sat-nav's

Postby Ivan C » Fri Mar 13, 2020 8:10 am

A fair point - I have been caught by the tunnel exit one.
Good practice to check the screen before going into a tunnel and also to have a mental overview of the route, so that if you do lose reception you have a rough idea what direction to take.
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Mark Hadley
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Re: Mobile phones and sat-nav's

Postby Mark Hadley » Tue Mar 17, 2020 10:29 am

My understanding is that phones also use information from the phone users to augment satellite signals.

It is thus accurate position that is sent automatically if you call emergency services.


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