if it is a cross instead of a X,, usually means a trail marker, most often a slight change in direction,,, most often follow in direction of longest line,, long arm might point to treasure, mine, or next symbol,,,,,,, sometimes follow direction of top.......if an " X " = on line to mine or treasure, or here this place, or to break or divide, or change in course, or landmark, or 10.......if it looks like a " + " then it means change in course or direction change............ any other symbols nearby might add new meaning also,,,,,,,,,,,,,,