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Slowtwitch Forums: Triathlon Forum:
Garmin 301 used during IMAZ

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Gator1736

Apr 14, 05 15:02

Post #26 of 36 (1428 views)

Re: Garmin 301 used during IMAZ [jnielsen] [In reply to]	Can't Post

Unbelievably cool. Is the software compatible with Macs?

jnielsen

Apr 14, 05 19:55

Post #27 of 36 (1397 views)

Re: Garmin 301 used during IMAZ [Gator1736] [In reply to]	Can't Post

In Reply To:

Unbelievably cool. Is the software compatible with Macs?

I don't think the Garmin specefic SW is MAC compatible. But what I posted was using a free web-based site. I wouldn't think it would be a problem, but you should ckeck with montionbased.com to verify.

jO4

Apr 15, 05 7:17

Post #28 of 36 (1357 views)

Re: Garmin 301 used during IMAZ [jnielsen] [In reply to]	Can't Post

Very cool... I have the 201 but I think the 301 is in my near future. Have you tried topofusion? It allows you to 3d render your workouts from satellite photos as well as topo maps. If you are in an urban area the resolution is .25 meters!
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Don't hold back

tri-poser

Apr 15, 05 7:44

Post #29 of 36 (1349 views)

Re: Garmin 301 used during IMAZ [jnielsen] [In reply to]	Can't Post

That is unbelievably cool... I have the 301 but never thought it could do all that... thank you for showing us what it can do.

Dude, what an awesome post.

Thanks again,

Trev

OT in CA

Apr 15, 05 9:43

Post #30 of 36 (1326 views)

Re: Garmin 301 used during IMAZ [jnielsen] [In reply to]	Can't Post

Someone already asked but I'm gonna bump to ask it again - whats up with the elevation data? 4200' of climbing for IMAZ? I can't see any computer generating that much on that course no matter how high the resolution.

Do 301 owners typically find thier elevation data to be this wacky or exaggerated?

ot

jnielsen

Apr 15, 05 10:08

Post #31 of 36 (1317 views)

Re: Garmin 301 used during IMAZ [OT in CA] [In reply to]	Can't Post

In Reply To:

OT in CA

Apr 15, 05 10:24

Post #32 of 36 (1304 views)

Re: Garmin 301 used during IMAZ [jnielsen] [In reply to]	Can't Post

I think the forum just ate your response...

ot

pepp01

Apr 18, 05 18:41

Post #33 of 36 (1240 views)

Re: Garmin 301 used during IMAZ [jnielsen] [In reply to]	Can't Post

How did you get your data uploaded to MB. I am using a 301 and MB will not synch my data with my watch. It is all there, swim, T1, Bike, T2 and Run. I had no trouble getting it into Training Center. Is there a trick?

Congrats by the way.

Pepper

cowtippers

Apr 19, 05 5:24

Post #34 of 36 (1190 views)

Re: Garmin 301 used during IMAZ [OT in CA] [In reply to]	Can't Post

The elevation issue is my only complaint with the 301. I think it has a hard time with the resolution of the elevation. If you stand in one spot you will notice that the elevation may vary +/-20 feet continuously. This is where you get the wacky numbers for elevation. I did a 10k in downtown Houston in February and the 301 said there was 600 feet of climbing - not a chance / it may have been 5 feet of climbing. I had a friend do a 60 mile ride west of Houston that had almost 3000 foot of climbing. Actual elevation change was 50 feet max. The only climbing in Houston is in the downtown parking garages.

Elevation seems to be the only problem. Distance is not - If I run different sides of the street on a run it will show this linear distance change. Maybe as the software evolves the elevation will get in line.

Wants2rideFast

Apr 19, 05 6:05

Post #35 of 36 (1176 views)

Re: Garmin 301 used during IMAZ [cowtippers] [In reply to]	Can't Post

cowtippers,

You are on to part of the problem of measuring altitude with GPS data from consumer GPS devices.

These devices are not all that accurate in measuring altitude variations accurately, especially on rolling terrain.

I have tested software for the 201 and 301. It has been my experience that the variation between the GPS data that these devices record and topographic information for the same route generally varies by 25-35% on the low side for GPS measured elevation changes. The maximum variation that I have observed is 44% lower than the topographic record. The smallest variation I have observed was 4% but this was a glaring isolated instance! The next closest variation was over 20%.

On flat routes, the variation tends to be a positive variation, again in the 25-35% range. The biggest contributor to these variations appears to be the "floating" nature of consumer GPS elevation readings.

This is one of the primary reasons that most consumer GPS units that advertise the measurement of elevation and elevation changes use barometric altimeters to measure elevation and elevation changes.

It has been my experience that the linear distance measurements of the 201 and 301 have been extremely consistent and accurate and the variation in linear distance measurement from topographic data for the same route has been less than 1% and generally in the 0.1-0.5% range.

I hope that help. FWIW.

Ben Cline

Better to aspire to Greatness and fail, than to not challenge one's self at all, and succeed.

dire wolf

Jun 20, 05 19:33

Post #36 of 36 (1089 views)

Re: Garmin 301 used during IMAZ [pacifico] [In reply to]	Can't Post

In Reply To:

I did the race and both bike & run felt pretty flat to me. It didn't feel like 4k of elevation change on the bike and 3k on the run. Is this really correct?

I wasn't there, but probably not. This race was before MB added the "MB Gravity" feature, which uses cartographic data to correct the Garmin's problems with elevation. You can go back and run the MB Gravity feature on old data. In most cases, it will severely reduce the total elevation gain or lost. In one rare case I had, it actually increased the gain.

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What a drag it is getting old. -- Stones

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