[BC] GPS for Proofing (WAS:dBm, dBc, dBd)

[Robert Reymont]

By the way, Delorme GPS is accurate only on flat surfaces.  If you 
have radials that go up and down hills there will be big time 
errors.  Delorme uses aerial photography to do the maps.  This means 
it works really good on a flat earth plane.   On hills, I have found 
the error to be off several hundred feet.  If you don't believe me, 
look at the street map of San Francisco...  All those streets are 
straight but not in Delorme!!

Have fun.

Robert

At 04:42 PM 11/16/2005 -0500, you wrote:
>Hi Alan thats what I did with the delorme atlas 2006 maps... I took 
>the pointer from the transmittersite and drew out lines( radials) 
>out to the 15km Point....  then zoomed in and Flagged points along 
>the radials  where it crossed near intersections . the GPS is not 
>that accurate But it Gets you to the Points . I have found that on 
>some days the GPS is correct and other days  its off by 100 
>feet  but  the intersections dont move.. so  I take the readings 
>where the radial crosses that intersection..
>with the War going On  I think Our Govt plays with the Error rate on 
>the GPS Birds.. Only a Surveyers  GPS  is dead on accurate. and I 
>believe  they sign a waver with the Govt  to use them??( military 
>specs on a surveyers GPS for accuracy)thats why they are so expensive.
>Otherwise  Its the old standard  look for telepone pole # 45675ED
>at intersection of church and broom streets. then go 20 feet across 
>street from pole on west side of road..  LOL
>been to alot of places over the years  where the Old Barn is now 
>missing   and its a golf course
>the best one was monday  the road ended... but continued into the 
>woods 500 feet between the  end of the road and the Interstate. the 
>point was 250 feet in from the interstate.. Pulled out the 500 foot 
>tape rule and walked  in 250 feet to take the reading..  If I didnt 
>do that  there would be 4km between the Points I needed Every 
>2km..   that was the only Oddball point..
>the 330 degree was the easy one  this road  was a giant sinewave... 
>The radial crossed it 7 times. and exactly at intersections.. So we 
>took the Points at the 7 corners..'
>I guess its easy on a new install  Because you can make up all the 
>points new from scratch
>Neal
>
>Alan Alsobrook wrote:
>
>>With the GPS V I've surprised myself as to some of the things I 
>>could do with it if I thought about it.
>>One I did was when I was out installing Sirius TR sites I hit a 
>>site Wilmington De, where the building was drawn on the blue prints 
>>at the wrong angle. This would have resulted in the sector antennas 
>>being placed improperly and interfering with another site. I did 4 
>>or 5 walking trips down the edge of the building to confirm my 
>>thoughts (which they did) and then went back and did averaged 
>>locations (100 or so measurements) on the corners of the building. 
>>With all the data in hand I was able to properly reorient the 
>>antennas for the coverage desired. Had to do a bunch of explaining 
>>when the antennas didn't look right in the pictures in the daily 
>>report though!! :)
>>
>>BOB MATZNER wrote:
>>
>>>I tried using the older unit for survey work when I was with M-1/AT&T
>>>BB...and it was useless for measuring distances...still needed the measuring
>>>wheel.  New one is no better.
>
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