Perhaps you and your associates will want to know that I've performed numerous accuracy (or lack thereof) tests on multiple rangefinders (with compass) and smartphone apps (Android/iPhone) to prove that a) they all are quite inaccurate - up to 20 degrees or more and b) the azimuth errors can be...
BaseMap does not provide any means to correct compass deviation (after calibration) errors.
Don’t trust the smartphone or rangefinder electronic compass.