Micro Doppler presentations in head worn computing

A method, comprising:

• a. receiving a micro Doppler signature indicative of a projectile flight path;
• b. identifying a beginning trace marker and a termination trace marker;
• and
• c. presenting in a head-worn computing system field of view digital content representative of the projectile flight path,
• wherein the beginning trace marker and termination trace marker provide a world-lock perspective for a wearer of the head-worn computing system such that the digital content appears to remain referenced to the environment independent of a position of the head-worn computing system.