NB: All ARPA plots in Yacht Master and OOW Navigation and Radar courses follow the Criteria of MGN379. That is, it assumes the conditions of IMO minimum specifications….
TRUE MOTION = TRUE TRAIL
RELATIVE MOTION = RELATIVE TRAILS
Remember that the only time that own ship vector can indicate the mode of set up is if it is not in line with your heading marker. In this case you are in True Motion, Ground stabilised.