[BC] GPS

[Mike McCarthy]

Precisely...  And at 10 miles, the mil is something less than 40 
ft.  Pretty darn tight.

HOWEVER, keep in mind there is a jitter factor on some RX's.  Remain 
stationary.and you will see the coordinates move about +/- 1 second in all 
directions.  So when you make things too tight,  you will see some jitter 
on the actual line.

MM

At 11:29 PM 2/5/2009 -0500, Alan Alsobrook wrote
>Cowboy wrote:
>>  The further out you go, the more accurate, and the more expensive
>>  the approximation will be, but "good enough" for most purposes.
>>  It's still limited to the bearing display resolution of the GPS, which 
>> I've yet
>>  to see a consumer grade better than 1/2 degree even though most  can 
>> resolve mush more accurately internally.
>
>If you need to get a bit better accuracy on your bearing display (as long 
>as I have the dead on target route line, I really don't need to) you can 
>switch your bearing from "Deg" to "Mils" (at least on the GPS V). Since 
>their are 6400 Mils in a circle, as compared to 360 Deg, it give you a 
>much narrower beam for your radial. I just checked it this afternoon at 
>27.8 miles out from a point the width of a Mil came up to about 145'.  You 
>could walk about half a mile to get a deg tick at that distance.
>
>Conversion formulas are here, http://home.online.no/~sigurdhu/Deg_formats.htm
>
>--
>Alan Alsobrook CSRE AMD CBNT
>St. Augustine Fl. 32086 904-829-8885
>aalso at Bellsouth.net