I was trying SURVEX for underwater survering in feet. Does the following look correct? It appears to work ;) *calibrate depth 0 -1 *units tape depth feet *data diving from to tape compass fromdepth todepth CLJ1 CLJ2 19 90 99 99 CLJ2 CLJ3 32 95 99 98 CLJ3 CLJ4 2 98 98 98 CLJ4 CLJ5 4 98 98 97 CLJ5 CLJ6 23 70 97 93 etc. --- Richard Blackburn