Operational Navigation Flight Training Instruction
MEF: Maximum elevation figure; the tallest object in a grid of a chart used in low-level navigation.
MFR: Minimum fuel required; minimum fuel to complete an entire route from a checkpoint; on the low-
level jet flight log.
Navigation Plotter: Also known as Weems plotter; used for headings and distances; may have statute
miles rather than nautical miles. See also combat plotter.
No Joy: No sight (or lost sight) of target.
Operational Navigation Chart (ONC): A Department of Defense navigation chart for use above 5,000
AGL; scaled 1:1,000,000.
SAM: Surface-to-air missile.
Sectional Chart: A civilian chart scaled 1:500,000. Published by the National Oceanic and Atmospheric
Shackle: A road recce maneuver used to correct the formation and check six; not the same as the
shackle in Tactical Formation. See also Weave.
Strip Chart: The chart of a particular mission cut and pasted to kneeboard size.
Supply Convoy: One or more trucks observed during a road recce.