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busterboy Occasional Visitor
Joined: Feb 25, 2006 Posts: 5
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Posted: Sat Feb 25, 2006 11:02 pm Post subject: garmin i3 |
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hello there....very nice forum..and i,ve just got myself a i3 today had to travel 35 miles to get one...all sold out near me 8O
the thing i wonna ask is.....can i get a MPH reading that shows my speed when driving all the time ??
nooby question sorry |
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PaulB2005 Pocket GPS Moderator
Joined: Jan 04, 2006 Posts: 9323 Location: Durham, UK
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Posted: Sat Feb 25, 2006 11:09 pm Post subject: |
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No |
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ride4smilesjonny Regular Visitor
Joined: Dec 29, 2005 Posts: 222 Location: teesside
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Posted: Sat Feb 25, 2006 11:11 pm Post subject: |
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The mph only displays when the unit is turned on but not on a route!
Welcome to the i3 world... 8) _________________ **********************************
Hi ho - Hi ho its off to Arran i go,
with my i3 and a cup of tea hi ho, hi ho
hi ho hi ho.....
**********************************
www.ride4smiles.co.uk
£3500 raised in two weeks! :-) |
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Mr_Gonzales Regular Visitor
Joined: Oct 05, 2005 Posts: 123 Location: Mmm...medway
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Posted: Sat Feb 25, 2006 11:51 pm Post subject: |
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I noticed recently that when the i3 loses the signal (dartford tunnel for me) it shows the speed until the signal is picked up again, then it goes back to ETA. Nice little touch, though would be nicer if it could show it all the time. If you know the route, or the turning off (especially on a motorway) is shown as 20 miles away or something, I stop the navigation sometimes so that I can see the mph until I'm closer to the turnoff. It's a compromise but it's handy when going past the increasing number of average speed check areas at roadworks now. |
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ride4smilesjonny Regular Visitor
Joined: Dec 29, 2005 Posts: 222 Location: teesside
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Posted: Sun Feb 26, 2006 12:54 am Post subject: |
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Mr_Gonzales wrote: | I stop the navigation sometimes so that I can see the mph until I'm closer to the turnoff. It's a compromise but it's handy when going past the increasing number of average speed check areas at roadworks now. |
May sound a silly question but why not use your speedo? _________________ **********************************
Hi ho - Hi ho its off to Arran i go,
with my i3 and a cup of tea hi ho, hi ho
hi ho hi ho.....
**********************************
www.ride4smiles.co.uk
£3500 raised in two weeks! :-) |
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Ayla Occasional Visitor
Joined: Feb 23, 2006 Posts: 22
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Posted: Sun Feb 26, 2006 3:00 am Post subject: |
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ride4smilesjonny wrote: | Mr_Gonzales wrote: | I stop the navigation sometimes so that I can see the mph until I'm closer to the turnoff. It's a compromise but it's handy when going past the increasing number of average speed check areas at roadworks now. |
May sound a silly question but why not use your speedo? |
I'm so glad you asked the silly question, it saved me doing so!
As a newbie to satnavs, I was wondering why one would need to see the speed, and whether it was safe to stop the navigation while driving, and how to get it to start again without going through the whole Where To process. I thought it was a special satnav "thing". |
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PaulB2005 Pocket GPS Moderator
Joined: Jan 04, 2006 Posts: 9323 Location: Durham, UK
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Posted: Sun Feb 26, 2006 11:05 am Post subject: |
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The speedo on the i3 will be inaccurate because it always calculates the speed relative to a flat surface and doesn't take into account the rise and fall of the road.
If you think about a 90 degree triangle where you are driving up the longest side the sat nav will be calculating you speed relative to the length of the horizontal side and not the side you are driving up. The horizontal side will be shorter than the surface you are driving up and hence the speed reading (distance x time) will be using the wrong distance and make the reading inaccurate. The sat nav has no way of measuring altitude to take into account the rise and fall of the roads.
I find it terribly distracting and wish i could turn it off now..... |
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ride4smilesjonny Regular Visitor
Joined: Dec 29, 2005 Posts: 222 Location: teesside
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Posted: Sun Feb 26, 2006 12:08 pm Post subject: |
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Mr_Gonzales wrote: | I noticed recently that when the i3 loses the signal (dartford tunnel for me) it shows the speed until the signal is picked up again |
Mr G, surely this is an estimated speed as the speed is calculated from the sats, so surely no sat signal = no speed? or am i missing something? _________________ **********************************
Hi ho - Hi ho its off to Arran i go,
with my i3 and a cup of tea hi ho, hi ho
hi ho hi ho.....
**********************************
www.ride4smiles.co.uk
£3500 raised in two weeks! :-) |
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busterboy Occasional Visitor
Joined: Feb 25, 2006 Posts: 5
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Posted: Sun Feb 26, 2006 2:20 pm Post subject: |
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i did,nt think about that...but anyway well happy with my i3......i drive a lorry and the i3 is better then pulling over askin for directions or stopping to read maps..."which can take 5 mins to even find a space to pull over".....should of got 1 age's ago .......... :P |
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paulhgc Regular Visitor
Joined: Feb 23, 2006 Posts: 88
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Posted: Sun Feb 26, 2006 5:25 pm Post subject: |
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busterboy wrote: | i did,nt think about that...but anyway well happy with my i3......i drive a lorry and the i3 is better then pulling over askin for directions or stopping to read maps..."which can take 5 mins to even find a space to pull over".....should of got 1 age's ago .......... :P |
me 2 i will be driving lorries and coaches and if this thing does the job and @ only £150 this will be the hottest selling item since the i pod in my opinion |
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Spenk Occasional Visitor
Joined: Jan 18, 2006 Posts: 19 Location: Oxfordshire
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Posted: Mon Feb 27, 2006 12:07 am Post subject: |
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I believe that satnavs can compute your altitude (2 sats for present position ((Lat Long)), and 3 can be used to compute height), so perhaps it can take in to account whether you are travelling up or down hill when it calculates your speed? I would also imagine that most road gradients are so small that it will have little bearing on the accuracy of the MPH readout. Does the i3 spec not say that it is accurate to +/- 0.5 MPH? |
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PaulB2005 Pocket GPS Moderator
Joined: Jan 04, 2006 Posts: 9323 Location: Durham, UK
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Posted: Mon Feb 27, 2006 9:27 am Post subject: |
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Quote: | I believe that satnavs can compute your altitude (2 sats for present position ((Lat Long)), and 3 can be used to compute height), so perhaps it can take in to account whether you are travelling up or down hill when it calculates your speed? |
Nuts. Never thought of that!
Quote: | I would also imagine that most road gradients are so small that it will have little bearing on the accuracy of the MPH readout. |
True.
Quote: | Does the i3 spec not say that it is accurate to +/- 0.5 MPH? |
Not sure but i also don't know how (in)accurate my car's speedo is either. So the GPS speed could be "true" and the analogue dial on my dashboard way off..... |
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MaFt Pocket GPS Staff
Joined: Aug 31, 2005 Posts: 15145 Location: Bradford, West Yorkshire
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Posted: Mon Feb 27, 2006 11:02 am Post subject: |
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PaulB2005 wrote: | The speedo on the i3 will be inaccurate because it always calculates the speed relative to a flat surface and doesn't take into account the rise and fall of the road.
...The sat nav has no way of measuring altitude to take into account the rise and fall of the roads.
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i'm not convinced... the nuvi can give you altitude calculations (in the satellite view mode it gives speed, direction and altitude) and a nuvi and i3 next to each other show the same calculated speed...
MaFt |
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Skippy Pocket GPS Verifier
Joined: 24/06/2003 00:22:12 Posts: 2946 Location: Escaped to the Antipodies! 36.83°S 174.75°E
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Posted: Mon Feb 27, 2006 2:49 pm Post subject: |
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MaFt wrote: | i'm not convinced... the nuvi can give you altitude calculations (in the satellite view mode it gives speed, direction and altitude) and a nuvi and i3 next to each other show the same calculated speed... |
Garmin quote a speed accuracy of "0.05 meter/sec steady state" which is about 0.1 MPH.
I think the GPS records speed over ground and although it knows it, the vertical speed is ignored.
The real test is to jump out of a plane with one and see what speed it records. Anyone? _________________ Gone fishing! |
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MaFt Pocket GPS Staff
Joined: Aug 31, 2005 Posts: 15145 Location: Bradford, West Yorkshire
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Posted: Mon Feb 27, 2006 4:10 pm Post subject: |
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Skippy wrote: |
The real test is to jump out of a plane with one and see what speed it records. Anyone? |
just sent the nuvi back today so could try it with the i3. i'll let you know by the weekend ;) |
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