2nd odometer question.
#31
Guest
Posts: n/a
Re: 2nd odometer question.
If you are getting 3m accuracy it is turned off. With the inaccuracies
switched on it was about 50m off IIRC. Some GPS receivers support
supplementary readings from (usually costal) radio transmitters which can
get it down to 1.5m ; this is called DGPS (Differential GPS).
Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"SB" <chicbearsmook@hotmail.com> wrote in message
news:x5NLc.5162$5GQ.517@news04.bloor.is.net.cable. rogers.com...
> I had thought that the US gov't had declassified the GPS offset thing.
> Basically that they had turned off the function that causes inaccuracies.
> If it's still on now...well....I've been able to get 3m accuracy which
seems
> to me to still be pretty good. Any small warhead would still do damage if
> it was 3m off!! So I dunno!!
>
> We use the same network of GPS satellites. I'm not sure of the "spacing"
of
> them but I don't think we use the same sat in the Yukon that someone in
> florida uses.
> Isn't there like 30 sats for gps??
> I know that towards the poles, sometimes there's not enough sats 'visible'
> to your reciever to give it a proper reading!
>
>
> "Old Crow" <walliscrow@yahoo.com> wrote in message
> news:6hvuf05r6i6cmso4hf9mtj5pcaujpbkkuf@4ax.com...
> > On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > >When I got my CJ7 it had 31's on it and i swore it was reading off the
> > >wrong way. Put 33's on and it checks out with my GPS perfectly.
> > >
> >
> > The owners manual to my GPS says that the groundspeed on my GPS will
> > not always be accurate:
> >
> > "For security reasions, the U.S. Government introduces small
> > errors(selective availability)which can affect positioning
> > information. These errors are most noticeable while viewing speed,
> > heading, and elevation."
> >
> > Now, I know you're in Canada, but don't you guys use the same
> > satellites as us for GPS purposes?
> > --
> > Old Crow
> > '82 Shovelhead FLT 92" 'Pearl'
> > '95 Jeep YJ Rio Grande
> > ASE Certified Master Auto Tech + L1
> > TOMKAT, BS#133, SENS, MAMBM, DOF#51
>
>
switched on it was about 50m off IIRC. Some GPS receivers support
supplementary readings from (usually costal) radio transmitters which can
get it down to 1.5m ; this is called DGPS (Differential GPS).
Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"SB" <chicbearsmook@hotmail.com> wrote in message
news:x5NLc.5162$5GQ.517@news04.bloor.is.net.cable. rogers.com...
> I had thought that the US gov't had declassified the GPS offset thing.
> Basically that they had turned off the function that causes inaccuracies.
> If it's still on now...well....I've been able to get 3m accuracy which
seems
> to me to still be pretty good. Any small warhead would still do damage if
> it was 3m off!! So I dunno!!
>
> We use the same network of GPS satellites. I'm not sure of the "spacing"
of
> them but I don't think we use the same sat in the Yukon that someone in
> florida uses.
> Isn't there like 30 sats for gps??
> I know that towards the poles, sometimes there's not enough sats 'visible'
> to your reciever to give it a proper reading!
>
>
> "Old Crow" <walliscrow@yahoo.com> wrote in message
> news:6hvuf05r6i6cmso4hf9mtj5pcaujpbkkuf@4ax.com...
> > On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > >When I got my CJ7 it had 31's on it and i swore it was reading off the
> > >wrong way. Put 33's on and it checks out with my GPS perfectly.
> > >
> >
> > The owners manual to my GPS says that the groundspeed on my GPS will
> > not always be accurate:
> >
> > "For security reasions, the U.S. Government introduces small
> > errors(selective availability)which can affect positioning
> > information. These errors are most noticeable while viewing speed,
> > heading, and elevation."
> >
> > Now, I know you're in Canada, but don't you guys use the same
> > satellites as us for GPS purposes?
> > --
> > Old Crow
> > '82 Shovelhead FLT 92" 'Pearl'
> > '95 Jeep YJ Rio Grande
> > ASE Certified Master Auto Tech + L1
> > TOMKAT, BS#133, SENS, MAMBM, DOF#51
>
>
#32
Guest
Posts: n/a
Re: 2nd odometer question.
If you are getting 3m accuracy it is turned off. With the inaccuracies
switched on it was about 50m off IIRC. Some GPS receivers support
supplementary readings from (usually costal) radio transmitters which can
get it down to 1.5m ; this is called DGPS (Differential GPS).
Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"SB" <chicbearsmook@hotmail.com> wrote in message
news:x5NLc.5162$5GQ.517@news04.bloor.is.net.cable. rogers.com...
> I had thought that the US gov't had declassified the GPS offset thing.
> Basically that they had turned off the function that causes inaccuracies.
> If it's still on now...well....I've been able to get 3m accuracy which
seems
> to me to still be pretty good. Any small warhead would still do damage if
> it was 3m off!! So I dunno!!
>
> We use the same network of GPS satellites. I'm not sure of the "spacing"
of
> them but I don't think we use the same sat in the Yukon that someone in
> florida uses.
> Isn't there like 30 sats for gps??
> I know that towards the poles, sometimes there's not enough sats 'visible'
> to your reciever to give it a proper reading!
>
>
> "Old Crow" <walliscrow@yahoo.com> wrote in message
> news:6hvuf05r6i6cmso4hf9mtj5pcaujpbkkuf@4ax.com...
> > On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > >When I got my CJ7 it had 31's on it and i swore it was reading off the
> > >wrong way. Put 33's on and it checks out with my GPS perfectly.
> > >
> >
> > The owners manual to my GPS says that the groundspeed on my GPS will
> > not always be accurate:
> >
> > "For security reasions, the U.S. Government introduces small
> > errors(selective availability)which can affect positioning
> > information. These errors are most noticeable while viewing speed,
> > heading, and elevation."
> >
> > Now, I know you're in Canada, but don't you guys use the same
> > satellites as us for GPS purposes?
> > --
> > Old Crow
> > '82 Shovelhead FLT 92" 'Pearl'
> > '95 Jeep YJ Rio Grande
> > ASE Certified Master Auto Tech + L1
> > TOMKAT, BS#133, SENS, MAMBM, DOF#51
>
>
switched on it was about 50m off IIRC. Some GPS receivers support
supplementary readings from (usually costal) radio transmitters which can
get it down to 1.5m ; this is called DGPS (Differential GPS).
Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"SB" <chicbearsmook@hotmail.com> wrote in message
news:x5NLc.5162$5GQ.517@news04.bloor.is.net.cable. rogers.com...
> I had thought that the US gov't had declassified the GPS offset thing.
> Basically that they had turned off the function that causes inaccuracies.
> If it's still on now...well....I've been able to get 3m accuracy which
seems
> to me to still be pretty good. Any small warhead would still do damage if
> it was 3m off!! So I dunno!!
>
> We use the same network of GPS satellites. I'm not sure of the "spacing"
of
> them but I don't think we use the same sat in the Yukon that someone in
> florida uses.
> Isn't there like 30 sats for gps??
> I know that towards the poles, sometimes there's not enough sats 'visible'
> to your reciever to give it a proper reading!
>
>
> "Old Crow" <walliscrow@yahoo.com> wrote in message
> news:6hvuf05r6i6cmso4hf9mtj5pcaujpbkkuf@4ax.com...
> > On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > >When I got my CJ7 it had 31's on it and i swore it was reading off the
> > >wrong way. Put 33's on and it checks out with my GPS perfectly.
> > >
> >
> > The owners manual to my GPS says that the groundspeed on my GPS will
> > not always be accurate:
> >
> > "For security reasions, the U.S. Government introduces small
> > errors(selective availability)which can affect positioning
> > information. These errors are most noticeable while viewing speed,
> > heading, and elevation."
> >
> > Now, I know you're in Canada, but don't you guys use the same
> > satellites as us for GPS purposes?
> > --
> > Old Crow
> > '82 Shovelhead FLT 92" 'Pearl'
> > '95 Jeep YJ Rio Grande
> > ASE Certified Master Auto Tech + L1
> > TOMKAT, BS#133, SENS, MAMBM, DOF#51
>
>
#33
Guest
Posts: n/a
Re: 2nd odometer question.
If you are getting 3m accuracy it is turned off. With the inaccuracies
switched on it was about 50m off IIRC. Some GPS receivers support
supplementary readings from (usually costal) radio transmitters which can
get it down to 1.5m ; this is called DGPS (Differential GPS).
Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"SB" <chicbearsmook@hotmail.com> wrote in message
news:x5NLc.5162$5GQ.517@news04.bloor.is.net.cable. rogers.com...
> I had thought that the US gov't had declassified the GPS offset thing.
> Basically that they had turned off the function that causes inaccuracies.
> If it's still on now...well....I've been able to get 3m accuracy which
seems
> to me to still be pretty good. Any small warhead would still do damage if
> it was 3m off!! So I dunno!!
>
> We use the same network of GPS satellites. I'm not sure of the "spacing"
of
> them but I don't think we use the same sat in the Yukon that someone in
> florida uses.
> Isn't there like 30 sats for gps??
> I know that towards the poles, sometimes there's not enough sats 'visible'
> to your reciever to give it a proper reading!
>
>
> "Old Crow" <walliscrow@yahoo.com> wrote in message
> news:6hvuf05r6i6cmso4hf9mtj5pcaujpbkkuf@4ax.com...
> > On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > >When I got my CJ7 it had 31's on it and i swore it was reading off the
> > >wrong way. Put 33's on and it checks out with my GPS perfectly.
> > >
> >
> > The owners manual to my GPS says that the groundspeed on my GPS will
> > not always be accurate:
> >
> > "For security reasions, the U.S. Government introduces small
> > errors(selective availability)which can affect positioning
> > information. These errors are most noticeable while viewing speed,
> > heading, and elevation."
> >
> > Now, I know you're in Canada, but don't you guys use the same
> > satellites as us for GPS purposes?
> > --
> > Old Crow
> > '82 Shovelhead FLT 92" 'Pearl'
> > '95 Jeep YJ Rio Grande
> > ASE Certified Master Auto Tech + L1
> > TOMKAT, BS#133, SENS, MAMBM, DOF#51
>
>
switched on it was about 50m off IIRC. Some GPS receivers support
supplementary readings from (usually costal) radio transmitters which can
get it down to 1.5m ; this is called DGPS (Differential GPS).
Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ
"SB" <chicbearsmook@hotmail.com> wrote in message
news:x5NLc.5162$5GQ.517@news04.bloor.is.net.cable. rogers.com...
> I had thought that the US gov't had declassified the GPS offset thing.
> Basically that they had turned off the function that causes inaccuracies.
> If it's still on now...well....I've been able to get 3m accuracy which
seems
> to me to still be pretty good. Any small warhead would still do damage if
> it was 3m off!! So I dunno!!
>
> We use the same network of GPS satellites. I'm not sure of the "spacing"
of
> them but I don't think we use the same sat in the Yukon that someone in
> florida uses.
> Isn't there like 30 sats for gps??
> I know that towards the poles, sometimes there's not enough sats 'visible'
> to your reciever to give it a proper reading!
>
>
> "Old Crow" <walliscrow@yahoo.com> wrote in message
> news:6hvuf05r6i6cmso4hf9mtj5pcaujpbkkuf@4ax.com...
> > On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > >When I got my CJ7 it had 31's on it and i swore it was reading off the
> > >wrong way. Put 33's on and it checks out with my GPS perfectly.
> > >
> >
> > The owners manual to my GPS says that the groundspeed on my GPS will
> > not always be accurate:
> >
> > "For security reasions, the U.S. Government introduces small
> > errors(selective availability)which can affect positioning
> > information. These errors are most noticeable while viewing speed,
> > heading, and elevation."
> >
> > Now, I know you're in Canada, but don't you guys use the same
> > satellites as us for GPS purposes?
> > --
> > Old Crow
> > '82 Shovelhead FLT 92" 'Pearl'
> > '95 Jeep YJ Rio Grande
> > ASE Certified Master Auto Tech + L1
> > TOMKAT, BS#133, SENS, MAMBM, DOF#51
>
>
#34
Guest
Posts: n/a
Re: 2nd odometer question.
Old Crow wrote:
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
#35
Guest
Posts: n/a
Re: 2nd odometer question.
Old Crow wrote:
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
#36
Guest
Posts: n/a
Re: 2nd odometer question.
Old Crow wrote:
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
#37
Guest
Posts: n/a
Re: 2nd odometer question.
Old Crow wrote:
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> On Wed, 21 Jul 2004 17:06:07 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >When I got my CJ7 it had 31's on it and i swore it was reading off the
> >wrong way. Put 33's on and it checks out with my GPS perfectly.
> >
>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
>
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
>
> Now, I know you're in Canada, but don't you guys use the same
> satellites as us for GPS purposes?
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Interesting you mention that. My GPS will give me an accuracy reading
according to how many satellites it is picking up. On the 401 corridor
in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits
and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for
some kind of drop training (6000' old bush airfield) and my GPS has gone
insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and
sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with
the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
#38
Guest
Posts: n/a
Re: 2nd odometer question.
Old Crow <walliscrow@yahoo.com> wrote:
<snip>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
Selective Availability (SA) has been "turned off" since May 1st, 2000:
http://www.navcen.uscg.gov/gps/selec...ailability.htm
-John
<snip>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
Selective Availability (SA) has been "turned off" since May 1st, 2000:
http://www.navcen.uscg.gov/gps/selec...ailability.htm
-John
#39
Guest
Posts: n/a
Re: 2nd odometer question.
Old Crow <walliscrow@yahoo.com> wrote:
<snip>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
Selective Availability (SA) has been "turned off" since May 1st, 2000:
http://www.navcen.uscg.gov/gps/selec...ailability.htm
-John
<snip>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
Selective Availability (SA) has been "turned off" since May 1st, 2000:
http://www.navcen.uscg.gov/gps/selec...ailability.htm
-John
#40
Guest
Posts: n/a
Re: 2nd odometer question.
Old Crow <walliscrow@yahoo.com> wrote:
<snip>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
Selective Availability (SA) has been "turned off" since May 1st, 2000:
http://www.navcen.uscg.gov/gps/selec...ailability.htm
-John
<snip>
> The owners manual to my GPS says that the groundspeed on my GPS will
> not always be accurate:
> "For security reasions, the U.S. Government introduces small
> errors(selective availability)which can affect positioning
> information. These errors are most noticeable while viewing speed,
> heading, and elevation."
Selective Availability (SA) has been "turned off" since May 1st, 2000:
http://www.navcen.uscg.gov/gps/selec...ailability.htm
-John