If you are given an impromptu, uncharted hold with minimal notice, you may not have time to both draw it on the chart and figure out the entry.
Cessna 9006M hold Southeast of Manteca on the 120 degree radial, one minute legs, left turns. Expect further clearance at 1903, time is 1843.
Manteca is only five miles ahead! We use our DG as a chart!