On 12/23/14 12:37 PM, Wayne Kline wrote:
OK I do not want this to morph into the many proven ways to find TRUE north.
The compass extra on a I phone..... True north .... I assume it is via GPS
tribulation ??/
To follow up on the inherent accuracy or not of the iPhone, here's what
the author of the Theodolite app says:
On the latest iOS devices under optimal conditions (clear line of sight
to 4 sats), you can see GPS position accuracy as good as 10 feet and GPS
altitude accuracy as good as 15 feet. Azimuth accuracy can be as good as
2-5 degrees under optimal conditions (minimal magnetic interference).
All of these accuracies degrade as conditions degrade.
An exception is gyro/accelerometer accuracy, which is fairly steady at
0.1 deg under a range of conditions. So, any measurements or
computations using elevation/horizon angles (such as rangefinging,
targeting, surveying, observation, etc) can be quite accurate. Optical
measurements in the app (rangefinder) are also quite accurate, and will
be as good as the user’s ability to read the screen and interpret results.
Good enough for HF, probably not for moonbounce on UHF
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