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Old 05-05-2005, 10:58 AM   #1
PASSMORE OP
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Altitude/Elevation readings from a 276c

I am in need of some altitude/elevation readings... Seems this would be a terrific "excuse" to pick up a 276c that I have been coveting

In what incriments does the 276c give these in? Have you found it to be accurate (to what +/-?).

Thanks in advance for your comments.
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Old 05-05-2005, 11:42 AM   #2
FatChance
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As for accuracy, I would expect the elevation error range to be about the same as the position error range, or accurate to within about 15 feet?
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Old 05-05-2005, 12:01 PM   #3
Eurobiker
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Your vertical accuracy is about twice the horizontal accuracy. So if you're good to 10 ft. horizontal, it'll be 20 ft. vertical. The relative accuracy of 2 points will be much better though. So if you want to know the delta height between 2 points, it's generally much better.

I just fired up my eMap and it showed my elevation at 5815 ft. with an accuracy of 16.8 ft. If you're out and find a USGS, FS or BLM benchmark with the elevation stamped on it, set your GPS receiver on the marker for an emperical check.
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Old 05-05-2005, 12:32 PM   #4
Bill the Duck
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May I heartily recommend GARMIN. See my recent thread in this forum.

BTW, I saw a 276c on JKAM's V-Strom last weekend. Quite readable even in direct sun. Cool features too.
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Old 05-05-2005, 01:22 PM   #5
txrider
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276c is a nice piece of gear, the only other contender is the 2610.

I would say the 20ft mentioned earlier is about right for accuracy, at least what the GPS reports.
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Old 05-05-2005, 02:09 PM   #6
Manuel Garcia O'Kely
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Yea, vertical accuracy is good....HA - I've driven across the Golden Gate Bridge and been told that I was a submarine - at -30 feet.

IF you are getting the WAAS signal and have it activated, accuracy improves but I'd say +/- 50 feet is more the rule - but who cares? That's close enough. Unless you are making a landing IFR and it's Zero-Zero [0' ceiling and 0' horiz. visiblity].
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Old 05-05-2005, 02:57 PM   #7
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I've noticed that my elevations readings can sometimes change when I'm sitting still. I gather that means that the satelites are moving around in space? In any case, my comparison of GPS versus Forest Service markers or USGS elevation points is that the GPS is no better than a + or - 50 feet at any given time. That's close enough for my purposes.
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Old 05-05-2005, 05:15 PM   #8
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We generally say that horizontal accuracy is 5-10 metres (15-30 ft) with WAAS off.

Vertical accuracy is 10-50 metres (30-150 feet). This is a 10-20 metre error plus up to a potential 30 metre discrepancy due to differences between the model used to calculate height and the true shape of the earth.
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Old 05-05-2005, 05:42 PM   #9
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When I drive along the coast highway, my 276c says I'm roughly -35 ft., -- snorkel territory. I'll call Garmin and see what they say, but I've found altitude to be pretty far off,... maybe it's just my unit.
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Old 05-05-2005, 07:33 PM   #10
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Elevation seems to be hit or miss...

I'd agree that vertical readings generally seem to have twice the error (at least) compared to horizontal position. On the other hand, every day on the way to work, I pass a 6,000 foot elevation benchmark. For a while, I was keeping my Garmin 76C in the car on a windshield mount and I'd fire it up when I left the house in the morning. As I'd pass the 6,000 foot marker, I'd glance at the GPS to see what it said. More often than not, it would be within a couple of feet, which I find amazing, because at other times it was 70 feet off of a known elevation...
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Old 05-05-2005, 08:24 PM   #11
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Mine is +/- 50 feet. I usually do the checking by the altitude markers that CalTrans puts oout. And knowing CalTrans, THEY are probably 50' off.

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Old 05-06-2005, 04:51 AM   #12
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Greeting,


Elevation accuracy with any GPS unit is dependent on the number of satellites you manage to track at a given moment. I use a Garmin SPIII+ and the error is rather small when I have a full compliment of signals to track. IT is NOT as accurate as a location - remember that thing is trying to compute elevation is 3D mode.

Even the best units I used while playing professional soldier has some elevation errors although locational were good to +/- 1 meter. Heck, 3 feet is pretty close - especially when close does count in horseshoes and hand grenades.

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Old 05-06-2005, 05:29 AM   #13
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Old 05-06-2005, 01:57 PM   #14
TiWorld
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FWIW, I called the friendly Garmin support line. Was told that the 276c elevation accuracy is +/- 100 feet.
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Old 05-06-2005, 06:03 PM   #15
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Dammit! Was hoping I could "get by" with one to get a base floor elev. for our building project. +/- 50 feet ain't gonna cut it for that....

Damn....
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