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Garmin Edge 305 question

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Garmin Edge 305 question

Old 02-23-06, 12:54 PM
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shardy53
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Garmin Edge 305 question

Why does it need the spoke sensor for the speed indicator? I thought it worked off of the GPS system?

Alsi when I attached the Cadence sensor and magnet, I had to shim the magnet closer to the pickup for it to work because it was too far away. The directions do not mention that, They only mention adjustiong the pickup arm for the spoke sensor.

Steve
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Old 02-23-06, 01:07 PM
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Well you don't need the speed sensor at all for speed...the unit will do it via GPS if you didn't have the CAD option. There are a couple of reasons to have it: #1 indoor training, this is obvious, you aren't moving so the GPS sensor is going to say you have a speed of 0. #2 is a little less obvious but GPS doesn't work as well in area without a clear sky...i.e. in cities with lots of tall buildings or in areas with heavy tree cover. In this situation the speed sensor will serve as backup and your speed will be more accurate.

As for the CAD sensor mounting I had to lean mine outward toward the crank arm to get it to pick up...it is pretty sensative so you don't need to be within 2mm like other units but within like 5mm. This does pose a potential problem that I amnd some other's have run into in that it moves the speed sensor arm in toward the spokes. In my case the magnet would brush the speedsensor arm unless I had it positioned vertically. Another member pointed out that if you position the magnet off the end of the speed sensor arm that is still picks up...I have gone this route as I would rather not have the arm in the upward position.

The Edge 305 is great...you will love it.
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Old 02-23-06, 02:24 PM
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If you want you speed to be accurate to +/- 20 feet, you can run GPS. If you like accuracy, the wheel is the way to go.

Think if you went into a deep canyon... There goes your speed.
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Old 02-23-06, 02:29 PM
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^^ That's right. Same reason there's a barometric altimeter . . . you could do elevation with GPS alone, but if you drop into a satellite "dead spot", you're out of luck.
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Old 02-23-06, 02:37 PM
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Originally Posted by Cypress
If you want you speed to be accurate to +/- 20 feet, you can run GPS. If you like accuracy, the wheel is the way to go.

Think if you went into a deep canyon... There goes your speed.
Originally Posted by 'nother
^^ That's right. Same reason there's a barometric altimeter . . . you could do elevation with GPS alone, but if you drop into a satellite "dead spot", you're out of luck.
Both points are valid in those situations, but the converse is also true for wireless transmitters in areas with high electro-magnetic fields (EMF). Living in urban SoCal, there are a lot of powerplants and high voltage lines (above and below ground). EVERY wireless bike computer that I have owned goes berserk in at least some of these areas. GPS seems to be "impervious" to EMF.
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Old 02-23-06, 06:14 PM
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My Edge is a lot more accurate than my Polar S725 ever was... My speed would display 0 during many points of the ride. There are certain sections of road that I ride that the Polar just does not work. The Edge, I've never see it lose speed and I only use the GPS Portion...
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Old 03-04-06, 12:32 AM
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A little off topic, but I need to know...

Does the Edge 305 have an odometer? Not just a trip odometer, but an overall odometer.
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Old 03-04-06, 06:51 AM
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Originally Posted by Mug
A little off topic, but I need to know...

Does the Edge 305 have an odometer? Not just a trip odometer, but an overall odometer.
Yes it does. If you hit the mode button until you get to the main menu, then select "History", then "Totals" it has the total time, distance and calories stored.
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Old 03-04-06, 09:55 AM
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Originally Posted by Grasschopper
Yes it does. If you hit the mode button until you get to the main menu, then select "History", then "Totals" it has the total time, distance and calories stored.
Ahh, OK I see it. Thanks Grasshopper!!
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Old 03-04-06, 08:21 PM
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Originally Posted by Grasschopper
Yes it does. If you hit the mode button until you get to the main menu, then select "History", then "Totals" it has the total time, distance and calories stored.
History Totals only totals those rides stored in the Edge. If or when you delete history, the totals will adjust to any remaining (if any) history. The 305 does not have a persistant odometer.
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Old 03-05-06, 05:12 PM
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I wonder if anyone has any feedback on the 3 aspects of the edge305.

1. Delay (if any) of cadence display. I have heard that on other wireless cadence computers (the new polars eg.) when you change cadence there is a multi-second delay. They seemed to have noticed a 5-10 second delay going to zero when you stop pedaling . .or when you start pedalling again. Of course, in those situations it doesn't matter much . .but it does indicated that changes from say 85rpm to 70rpm would have the same delay. Anyway . .if anyone has tested this aspect of the 305I'd love to know.

2. I also wonder how you find the auto/start stop delay at lights etc. Is it almost instant?

3. And finally, given the redundancy of the wheel sensor and gps for speed, does it negate the need to linger in your driveway while the satelites aquire (as on forerunner) and allow you to ride immediately and get accurate odometer etc.?

Many thanks.
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Old 03-05-06, 05:26 PM
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the auto stop/start is instantaneous...

i turn on the gps while it's still in the garage while i finish getting ready to leave..... but don't hit the start button til i get to the end of the driveway where i take my cleat covers off (i get signal in my garage)... i think i remember reading that you should acquire signal while stationary.. although not sure why?
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Old 03-05-06, 06:31 PM
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Good news on start/stop. So you do need to aquire satt before you ride to get accurate readings immediately? ie. wheel sensor won't do the job until satts kick in?
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Old 03-05-06, 06:47 PM
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i'm not sure.. i know the speed sensor will pick up if you go in a tunnel and lose signal... not sure about not having it yet in the beginning... why not just start it inside while puttin on your helmet.. gloves.. etc? it doesn't start recording til you hit start anyways... to that way you get your signal.. and by time time you are ready to leave... hit start and go!
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Old 03-05-06, 06:54 PM
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Originally Posted by caligurl
i think i remember reading that you should acquire signal while stationary.. although not sure why?
You have the potential for creating a bike ride that looks like this:


I started my ride before it locked up to the sat's. I noted that I was doing about 93 mph until the sat's got locked on to. Of course this was at the beginning so my distance for the ride was all screwed (showed about 60 miles after the first minute of riding). Fortunately where I am, the sat's get locked on to pretty quick.

Good Luck,
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