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Attackpoint - performance and training tools for orienteering athletes

Discussion: azimuth gradian?

in: Orienteering; General

Dec 28, 2020 7:40 PM # 
When using the ocad measure tool there is a listing for both azimuth and gradian...what's the difference? Is the azimuth the actual degree reading? ...talking about a straight line.
Dec 28, 2020 8:21 PM # 
Mr Wonderful:
The first number is the normal degrees you are used to, ie, out of 360 degrees. Gradians are 400 divisions per circle. If you check and n/s or e/w line it's probably easiest to see, for example:

180 degrees, and then 200 gradians.
Dec 28, 2020 10:13 PM # 
Ah-ha! Thanks!
Dec 29, 2020 5:21 AM # 
And pi radians...
Dec 29, 2020 3:11 PM # 
Terje Mathisen:
Anyone who has worked seriously on implementing trig functions in a modern cpu, in either hw or sw, knows that the only correct angle measurement is fraction of circles, i.e. either [0-1> for a full circle, or you can also use half-circles, so that [0-2> is a full circle.
BTW, all Garmin GPSs calculate angles as a 32-bit fixed-point value, i.e. 0:32 format.

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