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I have created a matlab file from a flight log using Mission Planner ver 1.2.99, and I want to plot some of the HUD variables vs time. For example I want to plot heading_mavlink_vfr_hud_t vs time.  It is a 2 column array and I think the first column is some sort of time representation but I can't figure out how to interpret it.  The first 3 values are

735699.4268189468

735699.4268194906

735699.4268314004

From the plot generated in Mission Planner, the actual time at the start was 10:14:37AM on 4/11/2014 (central time).

Can someone tell me how I get that from the numbers I am seeing? Thanks.