CREATE TABLE table_5964 ("Callsign" TEXT, "Area served" TEXT, "Frequency" TEXT, "Band" TEXT, "On-air ID" TEXT, "Purpose" TEXT)

Callsign of 6nan has what purpose?
SELECT "Purpose" FROM table_5964 WHERE "Callsign" = '6nan'
SELECT "Purpose" FROM "table_5964" WHERE "Callsign" = '6nan'