Those are standardized NATO map marking symbols. They have boxes with those in them to place on the chart; they didn't draw those themselves. In a tactical situation you'd be wasting time fishing for those things. If you were the commander of a large operation with many assets involved you'd need something like that. A submarine plotting crew in attack mode would need to draw things as quickly as possible. They didn't plot airplanes, they either shot at them or hid from them. The could only plot the specific ship the captain reported from the periscope; they had no idea what the other ships were doing or even where they were.
Symbols like those would more likely be used in a place like this:
http://www.uboatarchive.net/JtOpsCtrTour.htm