garmin i3

busterboy · Occasional Visitor Joined: Feb 25, 2006 Posts: 5

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 Embarassed

PaulB2005 · Posted: Sat Feb 25, 2006 11:09 pm Post subject:

ride4smilesjonny · Posted: Sat Feb 25, 2006 11:11 pm Post subject:

The mph only displays when the unit is turned on but not on a route!

Welcome to the i3 world... 8)
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£3500 raised in two weeks! :-)

Mr_Gonzales · Posted: Sat Feb 25, 2006 11:51 pm Post subject:

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.

ride4smilesjonny · Posted: Sun Feb 26, 2006 12:54 am Post subject:

Ayla · Occasional Visitor Joined: Feb 23, 2006 Posts: 22

PaulB2005 · Posted: Sun Feb 26, 2006 11:05 am Post subject:

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.....

ride4smilesjonny · Posted: Sun Feb 26, 2006 12:08 pm Post subject:

busterboy · Occasional Visitor Joined: Feb 25, 2006 Posts: 5

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

paulhgc · Regular Visitor Joined: Feb 23, 2006 Posts: 88

Spenk · Posted: Mon Feb 27, 2006 12:07 am Post subject:

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?

PaulB2005 · Posted: Mon Feb 27, 2006 9:27 am Post subject:

MaFt · Posted: Mon Feb 27, 2006 11:02 am Post subject:

Skippy · Posted: Mon Feb 27, 2006 2:49 pm Post subject:

MaFt · Posted: Mon Feb 27, 2006 4:10 pm Post subject:

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