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Search: Posts Made By: edmcnierney
Showing results 1 to 50 of 77
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Forum: Electronics, Lighting, & Gadgets
05-24-09, 06:43 PM
Replies: 20
Views: 1,757
Posted By edmcnierney

Actually, one of the techniques used to filter...

Actually, one of the techniques used to filter GPS data to meet user expectations is - in automotive GPS units - to strongly presume that you're actually driving on the road!
Forum: Electronics, Lighting, & Gadgets
05-24-09, 05:50 PM
Replies: 20
Views: 1,757
Posted By edmcnierney

Right, which means half the time the error's more...

Right, which means half the time the error's more than 15 meters :)

The chief cause of the wild fluctuations in GPS speed is not "loss of GPS coverage", strictly speaking, but switching between...
Forum: Electronics, Lighting, & Gadgets
05-22-09, 03:10 PM
Replies: 20
Views: 1,757
Posted By edmcnierney

Love that elevation graph! There's certainly...

Love that elevation graph!

There's certainly something else going on here. Under relatively steady conditions, the magnitude of the GPS position error will fluctuate within a relatively constant...
Forum: Electronics, Lighting, & Gadgets
05-22-09, 02:48 PM
Replies: 20
Views: 1,757
Posted By edmcnierney

Sorry - good point, and it was a typo on my part...

Sorry - good point, and it was a typo on my part (I have both the 305 and 705 in our house). Your quote from the manual seems to agree with what I was describing; I have no reason to think the two...
Forum: Electronics, Lighting, & Gadgets
05-22-09, 01:54 PM
Replies: 20
Views: 1,757
Posted By edmcnierney

Well, no, you don't. If the Edge 705 uses the...

Well, no, you don't. If the Edge 705 uses the GPS position data where possible, and falls back to the cadence sensor if necessary, and you were in a bad-GPS-reception situation, you would have seen...
Forum: Classic & Vintage
04-20-09, 07:55 PM
Replies: 3
Views: 1,291
Posted By edmcnierney

Thanks to you both for such quick replies. As I...

Thanks to you both for such quick replies. As I said, it's hard to imagine anyone ever popping off the dust caps on these things, so that makes sense. The extra space means there's room for a bit...
Forum: Classic & Vintage
04-20-09, 06:05 PM
Replies: 3
Views: 1,291
Posted By edmcnierney

1979 Fuji Royale Rear Hub Bearings

I just picked up this very nice bike for commuting. It's in good shape but in serious need of an overhaul - all the ball bearings were spinning clean and shiny in a bed of solid amber that probably...
Forum: Electronics, Lighting, & Gadgets
07-03-07, 08:31 PM
Replies: 6
Views: 710
Posted By edmcnierney

This will never happen, as most of those 30 sats...

This will never happen, as most of those 30 sats are, at any given moment, on the other side of the Earth from you. If you have a good signal from 6 or 7 you're fine, although letting the unit sit...
Forum: Bicycle Mechanics
06-21-07, 10:18 AM
Replies: 14
Views: 2,891
Posted By edmcnierney

Sshh! The manufacturing process is a trade...

Sshh! The manufacturing process is a trade secret - don't go giving it away.
Forum: Bicycle Mechanics
06-20-07, 12:39 PM
Replies: 14
Views: 2,891
Posted By edmcnierney

But there's no silicone in Scotchgard. It's a...

But there's no silicone in Scotchgard. It's a fluorinated urethane.
Forum: Electronics, Lighting, & Gadgets
06-19-07, 11:18 AM
Replies: 12
Views: 937
Posted By edmcnierney

If I recall correctly, one millibar pressure drop...

If I recall correctly, one millibar pressure drop (at around sea level) is about what you get with a 27-foot increase in altitude. So your variation is about one millibar or so.

Don't forget that...
Forum: Road Cycling
06-19-07, 10:49 AM
Replies: 56
Views: 3,997
Posted By edmcnierney

It's kinda weird, but works most of the time. ...

It's kinda weird, but works most of the time. You can upload routes that indicate where the turns are and in which compass direction you turn. But the 305 has no internal maps at all; it has no...
Forum: Road Cycling
06-19-07, 10:31 AM
Replies: 16
Views: 1,305
Posted By edmcnierney

Actually, I had forgotten that going to a good...

Actually, I had forgotten that going to a good optician's shop was an important part of the buy. I thought about buying online and realized I wasn't going to spend that much money sight unseen. I...
Forum: Road Cycling
06-15-07, 11:01 PM
Replies: 12
Views: 688
Posted By edmcnierney

No, we don't support route plotting of any sort. ...

No, we don't support route plotting of any sort. We use the USGS NED dataset to provide the exact elevation of any point you click on.
Forum: Road Cycling
06-15-07, 08:20 PM
Replies: 12
Views: 688
Posted By edmcnierney

Don't confused printed topographic maps with the...

Don't confused printed topographic maps with the digital elevation data available to be used by online mapping programs. They're two completely different sets of data.

I would expect that most...
Forum: Road Cycling
06-14-07, 03:05 PM
Replies: 43
Views: 2,102
Posted By edmcnierney

I got the Zeros (stainless, natch) to deal with...

I got the Zeros (stainless, natch) to deal with knee problems and they worked great. There are, of course, lots of different kinds of "knee problems" and your mileage may vary.

My right leg turns...
Forum: Electronics, Lighting, & Gadgets
06-14-07, 08:26 AM
Replies: 27
Views: 3,425
Posted By edmcnierney

No, actually, that elevation is not incredibly...

No, actually, that elevation is not incredibly accurate; no GPS will do that. But it will be very consistent among comparable recreational GPS units. Your friends will all have units that agree...
Forum: Road Cycling
06-13-07, 09:10 PM
Replies: 30
Views: 12,054
Posted By edmcnierney

Well, right now it's kinda dark, but sure. Funny...

Well, right now it's kinda dark, but sure. Funny you should ask - tonight I was just scoping out a ride there and back from my house in Groton (50 miles roundtrip with a bump in the middle).

Yes,...
Forum: Electronics, Lighting, & Gadgets
06-12-07, 02:14 PM
Replies: 27
Views: 3,425
Posted By edmcnierney

Any GPS unit will find it harder to calculate...

Any GPS unit will find it harder to calculate your elevation than your horizontal position. This is mainly due to simple geometry.

Your GPS is essentially triangulating your position by using the...
Forum: Electronics, Lighting, & Gadgets
06-11-07, 09:32 PM
Replies: 27
Views: 3,425
Posted By edmcnierney

Positional accuracy is dependent on a LOT of...

Positional accuracy is dependent on a LOT of other factors (atmospheric conditions, multipath reflections, etc.). Having spent quite a few years doing field GPS work with high-end (not consumer)...
Forum: Electronics, Lighting, & Gadgets
06-11-07, 08:50 PM
Replies: 27
Views: 3,425
Posted By edmcnierney

Yes, that's correct. So at the start of your...

Yes, that's correct. So at the start of your 50-mile ride your position might be off by 25 feet, and at the end of your 50-mile ride your position might also be off by 25 feet. Those errors could...
Forum: Road Cycling
06-11-07, 08:36 PM
Replies: 20
Views: 1,095
Posted By edmcnierney

There are two very nice rides in the Globe Pequot...

There are two very nice rides in the Globe Pequot book "Best Bike Rides - New England"; number 31 is the Bear Notch Challenge (37.7 miles) and number 32 is the White Mountains Triple-Notch Classic...
Forum: Road Cycling
06-11-07, 08:33 AM
Replies: 16
Views: 1,305
Posted By edmcnierney

I feel like I should throw in my positive vote...

I feel like I should throw in my positive vote for Rudy Project Kerosene glasses with prescription inserts. I'm moderately nearsighted and they are GREAT. Vision is excellent, and the inserts sit...
Forum: Road Cycling
05-31-07, 08:55 PM
Replies: 56
Views: 3,997
Posted By edmcnierney

Yes, it's really true that consumer-type GPS...

Yes, it's really true that consumer-type GPS units do a number of things that avoid "unexpected" results, whereas survey-grade units just tell it like it is (and have several other significantly...
Forum: Road Cycling
05-31-07, 07:15 PM
Replies: 29
Views: 2,048
Posted By edmcnierney

I thought you were going to say that "that guy"...

I thought you were going to say that "that guy" turned out to be you.....
Forum: Road Cycling
05-31-07, 03:54 PM
Replies: 56
Views: 3,997
Posted By edmcnierney

Two follow-up thoughts: 1. "Sources on the...

Two follow-up thoughts:

1. "Sources on the Web" say all kinds of things. Much of it is inaccurate. I am also a "source on the Web", as is everyone else here.

2. "The GPS reported accuracy...
Forum: Road Cycling
05-31-07, 03:52 PM
Replies: 56
Views: 3,997
Posted By edmcnierney

Yes, that's certainly true, but for a different...

Yes, that's certainly true, but for a different reason. To put it simply (and oversimplify) the GPS is triangulating your XYZ position by measuring your distance from three satellite transmitters. ...
Forum: Road Cycling
05-30-07, 09:36 PM
Replies: 56
Views: 3,997
Posted By edmcnierney

That kind of blip is not surprising when you...

That kind of blip is not surprising when you think about GPS errors. Any GPS will give you your location within a certain degree of accuracy. I haven't tried to rigorously test my Edge 305, but for...
Forum: Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling
09-29-06, 07:28 PM
Replies: 89
Views: 3,753
Posted By edmcnierney

Well, I'm confused

I don't understand. It sounds like you're calling me ignorant for reporting actual data measured on my rides. What's ignorant about that? I don't have any idea how I choose various intensities, or...
Forum: Road Cycling
09-02-06, 08:25 PM
Replies: 9
Views: 3,414
Posted By edmcnierney

I have never owned the X series but bought a pair...

I have never owned the X series but bought a pair of Zeros two weeks ago. I found the adjustable float feature extremely useful. Each cleat has two limit screws, adjusting the amount of "heel in"...
Forum: Road Cycling
08-30-06, 08:21 PM
Replies: 83
Views: 5,077
Posted By edmcnierney

The description of the route guidance feature...

The description of the route guidance feature seems a little fuzzy, so let me try to describe it (and hope I don't make it fuzzier!)

First - and this is important - the Edge 305 has no map, nor...
Forum: Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling
08-28-06, 06:52 PM
Replies: 30
Views: 3,106
Posted By edmcnierney

Yes, but that's irrelevant to this discussion...

Yes, but that's irrelevant to this discussion because the mountain stages in the TdF are uphill. They don't get to go DOWN L'Alpe d'Huez, do they?

All of the five mountain stages in this year's...
Forum: Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling
08-28-06, 06:15 PM
Replies: 30
Views: 3,106
Posted By edmcnierney

The problem is that that doesn't answer the...

The problem is that that doesn't answer the question. It just throws together a set of extreme, hypothetical numbers that have no relevance to the real world. As we've seen earlier in this thread,...
Forum: Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling
08-27-06, 08:07 AM
Replies: 30
Views: 3,106
Posted By edmcnierney

Do you go down hills 24 times faster than you go...

Do you go down hills 24 times faster than you go up them? :rolleyes: If not, then your math isn't helpful. We can all invent numbers. I think it would be helpful if other posters with actual...
Forum: Road Cycling
08-25-06, 07:34 PM
Replies: 28
Views: 3,589
Posted By edmcnierney

I'll chime in with the "drink more water" chorus...

I'll chime in with the "drink more water" chorus - you shouldn't be losing weight like that on a ride.

But absorption/osmolality/metempsychosis/voodoo factors are irrelevant as far as weight loss...
Forum: Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling
08-25-06, 07:11 PM
Replies: 30
Views: 3,106
Posted By edmcnierney

I think you need to measure it yourself. After...

I think you need to measure it yourself. After 1,000 miles of riding with my Garmin Edge 305, I can confirm that on hilly rides I average about 5 - 9% faster than on flat ones.

I live near a...
Forum: Road Cycling
08-23-06, 01:07 PM
Replies: 4
Views: 1,654
Posted By edmcnierney

My first GSC-10 arrived with a dead battery in...

My first GSC-10 arrived with a dead battery in it, so it is possible you just started out shortchanged. I had a different technical problem with my GSC-10 and Garmin was also excellent with a...
Forum: Road Cycling
08-21-06, 07:38 PM
Replies: 30
Views: 1,506
Posted By edmcnierney

I was recently in the same situation. I finally...

I was recently in the same situation. I finally went to a local optical shop / Rudy Project dealer because the Kerosene looked like a good choice but I was highly skeptical of the "clip-in" insert...
Forum: Road Cycling
08-20-06, 07:37 PM
Replies: 59
Views: 2,960
Posted By edmcnierney

The two work together very well. Your GPS is...

The two work together very well. Your GPS is much less accurate in measuring elevation than in measuring lat/lon position. A barometric altimeter needs to be told what the elevation is, but it is...
Forum: Road Cycling
08-16-06, 09:27 PM
Replies: 31
Views: 2,104
Posted By edmcnierney

FWIW, I was recently traveling and ended up...

FWIW, I was recently traveling and ended up riding the same 16.3-mile loop each day for 4 consecutive days using a Garmin Edge 305 with HRM. I did the loop twice clockwise and twice...
Forum: Professional Cycling For the Fans
08-09-06, 08:02 AM
Replies: 29
Views: 3,300
Posted By edmcnierney

No, that's not true, as evidenced by this thread....

No, that's not true, as evidenced by this thread. It is *possible* that the two statements posted at the start of this thread are both completely true and honest answers, and we've got people...
Forum: Professional Cycling For the Fans
08-08-06, 07:47 AM
Replies: 25
Views: 1,722
Posted By edmcnierney

I don't buy the "it would all have come out...

I don't buy the "it would all have come out anyway" argument. The UCI prides itself on unwavering adherence to the rules, and severe penalties for those who don't follow the rules. Good for them.
...
Forum: Professional Cycling For the Fans
08-08-06, 07:43 AM
Replies: 29
Views: 3,300
Posted By edmcnierney

Well, not to pick nits (these are reporters, not...

Well, not to pick nits (these are reporters, not court testimony), but the first interview asked him if he had an IV "that night" and were talking about the beer and JD. The second interview seems...
Forum: Professional Cycling For the Fans
08-01-06, 09:10 AM
Replies: 134
Views: 6,851
Posted By edmcnierney

Is it not the case that synthetic testosterone is...

Is it not the case that synthetic testosterone is what one would expect to find if the sample had been tampered with, too? I'm not lobbying for or against any conclusion, but I don't like jumping to...
Forum: Road Cycling
07-30-06, 02:41 PM
Replies: 38
Views: 1,399
Posted By edmcnierney

We were talking about bike GPS units here, not...

We were talking about bike GPS units here, not aviation units. As I said, the limitation in vertical accuracy is "in part due to physics and in part by design". The design part is that GPS units...
Forum: Road Cycling
07-30-06, 11:16 AM
Replies: 38
Views: 1,399
Posted By edmcnierney

No, that's actually not correct. Your GPS...

No, that's actually not correct. Your GPS receiver needs to be calibrated, too. It needs to be told the orbital elements of the GPS satellites so it knows where they are - otherwise it wouldn't...
Forum: Road Cycling
07-30-06, 11:11 AM
Replies: 38
Views: 1,399
Posted By edmcnierney

Please read my post - I said calibrate the...

Please read my post - I said calibrate the altimeter, not the GPS. I said that the GPS would be used to calibrate the altimeter, since the GPS can calculate your elevation - which I think is the...
Forum: Road Cycling
07-30-06, 09:32 AM
Replies: 38
Views: 1,399
Posted By edmcnierney

Yes, but the Edge 305 has a barometric altimeter...

Yes, but the Edge 305 has a barometric altimeter to determine the altitude independent of the GPS position. That graph could be a graph of the barometric altimeter's data only. My understanding of...
Forum: Road Cycling
07-30-06, 06:20 AM
Replies: 38
Views: 1,399
Posted By edmcnierney

Oops - it's early - I just realized you said...

Oops - it's early - I just realized you said "P-3", a machine which presumably does NOT operate at a constant elevation:rolleyes:

But it would be interesting to know what the standard for...
Forum: Road Cycling
07-30-06, 06:17 AM
Replies: 38
Views: 1,399
Posted By edmcnierney

I honestly don't know which units would use 3-D...

I honestly don't know which units would use 3-D vs. 2-D distance measuring. There's a reasonable argument for doing it either way. But there's absolutely no reason why any unit CAN'T do 3-D...
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