Probably fewer than a dozen mariner's astrolabes survive today, for the instrument was superseded by the back-staff, and cast away for 'scrap'.
Kwamsinya zazimbalwa kuneshumi elinesibini lencutshe ezisaphilayo namahlanje ngenxa yesilinganisi sokuthatha indawo kukubuya kwesitafu nokusikwa endleleni ngenxa 'yempambano'.