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Old 06-20-2013, 10:42 AM   #1
tdvt OP
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Small bike, off-road, day-ride only GPS?

Sorry for yet another query, I have read multiple threads but I'm still looking for advice as most threads seem oriented to longer distance DS touring, multi-day rides, etc.

I don't have a GPS, haven't used a GPS (other than a borrowed Nuvi in the car once) & want to have something to track trail rides/explore others GPS tracks, off-road.

I don't plan to wire it to the bike (250 w/minimal electrics) at this point, so the power connector issue is not really a main concern & in the end don't really mind changing batteries, since I ride mostly day rides.

Montana is too much $$ & sounds like more than I need, so I've narrowed down (not knowing much) to either a Garmin 78 or an Oregon 450.

Suggestions/insights?
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Old 06-20-2013, 10:58 AM   #2
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The 78 will do fine.
Even an eTrex provided there is something better than the bicycle mount for it.
I'm not a fan of touch screens.
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Old 06-20-2013, 11:15 AM   #3
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the 78 will do fine.
Even an etrex provided there is something better than the bicycle mount for it.
I'm not a fan of touch screens.
+1
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Old 06-20-2013, 11:52 AM   #4
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I'd agree with the 78. It's small and easy to use, and if you ever do decide to wire it up or put it on a bigger bike, you'll be ahead of the game.
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Old 06-20-2013, 11:54 AM   #5
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I've never used the 78, but I sure like my Oregon 450. I have no hesitations recommending one. GPS City had them on sale a few weeks back for $199. Can't beat that price, IMO.
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Old 06-20-2013, 01:26 PM   #6
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I have absolutely zero complaints with my Oregon 450. As EmmEff said, 199.00 is a pretty good price.
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Old 06-20-2013, 02:13 PM   #7
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Thanks for all your replies. Have to ponder the touch-screen vs. buttons thing. Screens seem fairly close in size which is a consideration for me.

Is the satellite acquisition pretty similar between them?
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Old 06-20-2013, 03:07 PM   #8
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Is the satellite acquisition pretty similar between them?
Check the spec. 78 is patch antenna, don't know what the Oregon uses. Quadhelix is better.
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Old 06-20-2013, 04:12 PM   #9
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Quadhelix is better.
In some cases yes, in other cases no. It depends on the size of each antenna, the orientation of the antenna, and other factors. If you keep your GPS somewhat "flat", a patch antenna of "equivalent" size will usually perform better. Also, the sensitivity of the receiver circuitry has a major effect. Without knowing the size of each antenna, and the receiver sensitivity, and the way the unit is to be mounted on the bike, it’s hard to say which would be better, though I suspect both would be very good. I would think the touch screen issue might be a bigger deciding factor.
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Old 06-20-2013, 04:27 PM   #10
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In some cases yes, in other cases no.
Does the antenna effect the accuracy of the lon/lat calculation or just the how much loss can be between the receiver and enough satellites? Loss would be pointing off main gain lobe, trees, building, water, etc
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Old 06-20-2013, 04:54 PM   #11
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I don't believe my Oregon is equipped with the retro-encabulator or the meso-helix modulator, but it has always been right where I am, and the touch screen works with gloves. The batteries last a long time, and in daylight you can turn the backlight off. It can get knocked around, and it picks up satellites in my living room (why I have satellites in my living room however, is a mystery).
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Old 06-20-2013, 06:08 PM   #12
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Comparing a 78s (patch) and a 60cx (quadhelix) laid flat side by each the 60 got a better gps accuracy reading. 78s - 10m; 60cx - 3m. Traded spots - same result.

Sometime when both owners are at the same place with some time to try it, this "test" will be repeated.
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Old 06-20-2013, 06:38 PM   #13
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76cx

I've got a couple of Garmin 76cx GPS units.

Within a couple of minutes I commonly see 9 FOOT accuracy.

Close enough for me! ;-)
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Old 06-20-2013, 06:45 PM   #14
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Does the antenna effect the accuracy of the lon/lat calculation
Yes and no. The number of satellites that the unit "sees" affects accuracy (more sats = better accuracy) because the signals from each are somewhat averaged to reduce error. A better antenna might see more satellites.
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Old 06-20-2013, 09:28 PM   #15
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Yes and no. The number of satellites that the unit "sees" affects accuracy (more sats = better accuracy) because the signals from each are somewhat averaged to reduce error. A better antenna might see more satellites.
That is exactly what I thought. So in open desert with low horizion for 360 degrees no possible difference. Besides with old 76C could not even get postion in redwood forests on north coast so as long as my76Cx & 78 locks on, I am happy traveler.
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