LWB wrote:Is your delta of 0.28 typical of what you got during calibration?
Actually, that's the best calibration I've had. The first was 0.55, the worst has been 0.65 (done in-cave), and the current is 0.46. However, even with the delta=0.65 we were generally getting FS/BS azimuth agreement to within 1 degree. The clino agreement is always within ~0.1 degrees regardless of the delta.
I've mostly been calibrating in an open area (greenbelt) that's a couple minutes walk from my front door. There are houses nearby, but I think it's clear enough to not have interference. I tried in my back yard, but there are buried cables or something that seem to be a problem, even for a Suunto. I've calibrated a few times in a cave, but haven't seen much difference from calibrating in the greenbelt.
The instructions suggest letting the reading stabilize before collecting a calibration point, but the LCD only displays CAL and the data point, so it's hard to know when it's stable. I do run through the measurements pretty quickly. I'm careful with the first 16 readings, but not so much with the remaining readings, and I don't aim at a target for readings 17-56. I've thought about deliberately going slower with those secondary readings to see if it influences the delta value.