2022-09-29, 03:01 AM
When I redid the 360 deg circle compass calibration, and it reported done with the message 'same as last', I locked it thinking that was the best way to handle it.
I did not take much note of the pitch and roll readings. I thought the six sided box calibration of the imu worked and was locked. The boat was then marked level. I will look at this next opportunity.
I did consider mounting the sensors remotely but thought I would not find a better place within the limitations on the I2C data connection given the area on the boat I wanted to locate the RPi. I guess just getting them off the RPi may have benefits. My thought here is that any interference from this would be random and lead to variations in readings without change of orientation. There is a bit of this, perhaps 1-2 deg, nothing like the differences in the readings.
The fluxgate is in a good location away from possible magnetic interference but, you are right, it may have some deviation that would not be corrected. Looking at the OpenCPN display, there have been times that the heading has not been aligned with the COG, always in a situation you would expect such as in cross current, but, otherwise, the correlation has been quite good. The difference between the Pypilot and the fluxgate readings is orders of magnitude above any deviation I would expect in the fluxgate.
I did not take much note of the pitch and roll readings. I thought the six sided box calibration of the imu worked and was locked. The boat was then marked level. I will look at this next opportunity.
I did consider mounting the sensors remotely but thought I would not find a better place within the limitations on the I2C data connection given the area on the boat I wanted to locate the RPi. I guess just getting them off the RPi may have benefits. My thought here is that any interference from this would be random and lead to variations in readings without change of orientation. There is a bit of this, perhaps 1-2 deg, nothing like the differences in the readings.
The fluxgate is in a good location away from possible magnetic interference but, you are right, it may have some deviation that would not be corrected. Looking at the OpenCPN display, there have been times that the heading has not been aligned with the COG, always in a situation you would expect such as in cross current, but, otherwise, the correlation has been quite good. The difference between the Pypilot and the fluxgate readings is orders of magnitude above any deviation I would expect in the fluxgate.