Vehicle came in for 2 year tacho check and speed was 85 kph,sticker fitted all done.
Next day vehicle brought back because it was "really " doing 92 kph.
Some numpty would rather believe some bloody sat nav over the tacho calibration.
He says to me its “satellite” and much more “accurate”
I ask him has he ever seen a satellite?Has he ever tried to use a “sat nav” on a ferry in the middle of the North sea or on an aircraft?Has he ever noticed that “satellite” dishes always point in the same direction as ordinary “yagi” aerials?
“sat nav” uses old technology from the 1940s eg radio mast triangulation but with a “map” programme built into a phone or receiver.Thats why they do not work at sea or in aircraft.
Ships and aircraft use short wave signals for navigation but microwaves from cell phone masts only works on line of sight transmission.His parting shot was “well if I get done for speeding I will blame you”
If GPS satellites existed why do we need upward of 30,000 cell phone masts just to cover the UK.
Another bloody con job
Sorry, he is right.
Our GPS satellites are accurate to within 1 metre, so that makes their speed measurement far better than any tacho calibration with worn/new tyres etc.
Cheers
Paul
So much nonsense here it’s difficult to know where to begin.
Satellite dishes point in the same direction because they point directly at a satellite. Satellite navigation works by comparing arrival times of signals sent from several satellites.
They do work at sea, in fact ships navigate almost exclusively by GPS.
You can’t see the satellites because they are too far away and too small to be seen with the naked eye.
sonflowerinwales:
Sorry, he is right.
Our GPS satellites are accurate to within 1 metre, so that makes their speed measurement far better than any tacho calibration with worn/new tyres etc.
Cheers
Paul
Same bloody tyres as when it was tested.And as I said why dont they work at sea or in an aircraft.Same reason your bloody phone doesnt work at sea or on an aircraft.They use the same masts.Ship navigation uses a totaly different frequency.
Do people really believe that you could transmit a 500 watt signal from 22000 miles up,that it would pass through the atmosphere,cab and into an antenna the size of a pin?
Why do “satellite” phones have to have a large external aerial?So that they can receive signals from land based masts that are more distant.
A bit of thought shows the impossibility of this tripe.
The gps is bang on. So many trucks are miscalibrated one way or the other. I think off the top of my head, I’ve only driven one in the past 8 years that’s done 56. The rest between 53-55 or 57-58
Bking:
Vehicle came in for 2 year tacho check and speed was 85 kph,sticker fitted all done.
Next day vehicle brought back because it was "really " doing 92 kph.
Some numpty would rather believe some bloody sat nav over the tacho calibration.
He says to me its “satellite” and much more “accurate”
I ask him has he ever seen a satellite?Has he ever tried to use a “sat nav” on a ferry in the middle of the North sea or on an aircraft?Has he ever noticed that “satellite” dishes always point in the same direction as ordinary “yagi” aerials?
“sat nav” uses old technology from the 1940s eg radio mast triangulation but with a “map” programme built into a phone or receiver.Thats why they do not work at sea or in aircraft.
Ships and aircraft use short wave signals for navigation but microwaves from cell phone masts only works on line of sight transmission.His parting shot was “well if I get done for speeding I will blame you”
If GPS satellites existed why do we need upward of 30,000 cell phone masts just to cover the UK.
Another bloody con job
Please tell us more about the satellites of the 1940s. Were they launched on V2 rockets?
Bking:
Vehicle came in for 2 year tacho check and speed was 85 kph,sticker fitted all done.
Next day vehicle brought back because it was "really " doing 92 kph.
Some numpty would rather believe some bloody sat nav over the tacho calibration.
He says to me its “satellite” and much more “accurate”
I ask him has he ever seen a satellite?Has he ever tried to use a “sat nav” on a ferry in the middle of the North sea or on an aircraft?Has he ever noticed that “satellite” dishes always point in the same direction as ordinary “yagi” aerials?
“sat nav” uses old technology from the 1940s eg radio mast triangulation but with a “map” programme built into a phone or receiver.Thats why they do not work at sea or in aircraft.
Ships and aircraft use short wave signals for navigation but microwaves from cell phone masts only works on line of sight transmission.His parting shot was “well if I get done for speeding I will blame you”
If GPS satellites existed why do we need upward of 30,000 cell phone masts just to cover the UK.
Another bloody con job
(Hang on… this clown is allowed to work on trucks? )
OVLOV JAY:
The gps is bang on. So many trucks are miscalibrated one way or the other. I think off the top of my head, I’ve only driven one in the past 8 years that’s done 56. The rest between 53-55 or 57-58
This, I’ve rarely driven a truck where the limiter (as seen on speedo) matched the speed on the calibration sticker.
Apparently sat navs can only give accurate speed on level ground (ie the device is moving in two dimensions at the same time if going up or down a hill). I am sure somebody will say I am talking ■■■■ though
098Joe:
Apparently sat navs can only give accurate speed on level ground (ie the device is moving in two dimensions at the same time if going up or down a hill). I am sure somebody will say I am talking [zb] though
Your talking ■■■■■■■■.
SaT nav…just doesn’t look right with a capital T to be honest.
switchlogic:
Christ alive, Bking has to be a troll surely! No one can possibly be that stupid/deluded?
my thoughts exactly.
However - At a steady speed in a straight line “Consumer Grade” GPS are going to be fairly accurate, but definitely not precise, also on a bend they will read slightly low and they are a little slow to act in change of speed. I also suspect under certain circumstances where the receiver does not have a good view of the sky and is only picking up a signal from two or three satellites that errors will creep in.
Consumer grade GPS are only accurate to about 10m, the super accurate ones that can read down to a few inches are incredibly expensive and involve base stations and lots of tinkering with.
098Joe:
Apparently sat navs can only give accurate speed on level ground (ie the device is moving in two dimensions at the same time if going up or down a hill). I am sure somebody will say I am talking [zb] though
True but the error would be tiny; even an incredibly steep hill of 1:4 would only give an error around 3%, but lets say a steep hill on a UK motorway of 1:25 error would be in the region of 0.08% (56 mph reading 55.96 mph)
Bking, you do talk such a load of ■■■■■■■■.
I have been using electronic navigation charts linked to a GPS receiver at sea for the last 20 years or so and have always got to my destination safely and knew where I was to a metre or two. The technology employed to determine speed, location and altitudes is so far advanced now it far beats a tacho by miles.
sonflowerinwales:
Sorry, he is right.
Our GPS satellites are accurate to within 1 metre, so that makes their speed measurement far better than any tacho calibration with worn/new tyres etc.
Cheers
Paul
switchlogic:
Christ alive, Bking has to be a troll surely! No one can possibly be that stupid/deluded?
yes they can ask imperial motors lol, i had this out with them, told me because the signal has to go up in the sky and back to the truck it cant be right, once i picked myself up off the floor, i asked what planet he was from
and its also strange, why does my brother in laws boat have gps and miles out at sea it tells us the speed, where we are and where we have been and where our good fishing spots are
098Joe:
Apparently sat navs can only give accurate speed on level ground (ie the device is moving in two dimensions at the same time if going up or down a hill). I am sure somebody will say I am talking [zb] though
Have to be me then How do you think aeroplanes manage then ?
It’s all down to triangulation and similar stuff.
now I am risking looking like Bking here but why put 85kph on the tacho calibration sticker if they get limited to 90kph? I have a feeling I know the answer but cant recall it.
Bking:
“sat nav” uses old technology from the 1940s eg radio mast triangulation but with a “map” programme built into a phone or receiver.Thats why they do not work at sea or in aircraft.
Ships and aircraft use short wave signals for navigation but microwaves from cell phone masts only works on line of sight transmission.His parting shot was “well if I get done for speeding I will blame you”
If GPS satellites existed why do we need upward of 30,000 cell phone masts just to cover the UK.
DUMBASS ALERT!!!
Satnav uses a string of satellites in geo-stationary orbit, not a string of masts on the ground. WASN’T THE NAME “SAT NAV” A BIG ENOUGH CLUE FOR YOU?. The satnav you have receives time stamp based signals from those satellites and works out where it is by the delay between the time of transmission and time of reception of the signal from each satellite. Ships and aircraft stopped using short wave for navigation when the GPS network went live for civilian use. Satnav works from any location on the planet with a clear view of the sky.
We need 30,000 cellphone masts because its an entirely different system where unlike GPS where the user is only receiving a signal, the user is also transmitting and not just receiving.
But thanks for confirming to everyone just how technologically ignorant you are. I hope you didn’t make a comment or smirk at him because it is actually YOU who is talking complete and utter ■■■■■■■■ and doesn’t know what they’re on about.
war1974:
now I am risking looking like Bking here but why put 85kph on the tacho calibration sticker if they get limited to 90kph? I have a feeling I know the answer but cant recall it.
I think its a eu thing to be limited to 85kph but they allow a small percentage +/- tolerance in setting, and the upper end of the tolerance comes in at 90kph
How do you think aeroplanes manage then ?