A blanket or cloth held over the smoke and released at intervals will produce an S.O.S. Morse sign that can be seen for many miles.
Ingubo okanye impanhla ephethwe phezu komsi kwaye zikhutshwe kwizithuba ziza kuvelisa iS.O.S. uphawu olumenyezelayo elenziwa ngumbane elinokubonwa iimayile ezininzi.