GIAA Mailbag: On Li-ion Battery Charging and PPM Corrections
Q: Instead of using a thermometer and barometer to measure atmospheric conditions to set the PPM atmospheric correction value on my EDM, I use a 100-ft tape to determine the correction. I stretch it out and set my EDM at one end and my prism pole at the other end. Then I vary the PPM settings until I read 100.000 ft. I attended a seminar recently where the speaker said this wasn't the right thing to do. Why?