the vernier still reads zero and has not moved during the operation. NOTE: To compensate for the above maladjust- ment, you should read all vertical angles direct and reversed; then use the average of the result. This   concludes   our   discussion   of   instrument adjustment. As a reminder, you should always check your  surveying  instruments  frequently  for  proper adjustment and then make those adjustments either immediately or as soon as practicable. Do not put it off or you may quickly forget to do it until it is too late. Also, be sure to check the manufacturer’s instructions before making  the  adjustments  described  above  or  when  you need to adjust other instruments, such as the automatic level, alidade, or hand level. MINOR REPAIRS AND REPLACEMENT PROCEDURES As  stated  earlier  in  this  chapter,  minor  repairs  to surveying instruments and equipment are those that can be done in the field with the use of simple tools. Major repairs  are  done  by  instrument  specialists  who  are generally   employed   by   the   manufacturers   of   the instruments. You should never attempt to make a major repair  yourself. Repair It or Replace It? Whether or not you or someone else in the battalion should  attempt  the  repair  of  a  damaged  item  of equipment depends on the nature of the damage and the character of the item. A broken tape, for example, can easily be spliced (explained in the EA3 TRAMAN). On the  other  hand,  whether  or  not  you  should  attempt  to straighten a bent compass needle depends on the type of compass   —for an ordinary pocket compass, perhaps yes; for the compass on a transit, perhaps no. Many types of  damage  to  such  articles  as  range  poles,  tripod  legs, and the like may be repaired in the battalion or PWD shops.  Minor  damage  to  instruments  maybe  repaired occasionally  in  the  battalion  machine  shop.  However, major   repairs   to   instruments,   when   they   are economically  worthwhile  at  all,  should  be  done  by manufacturers  or  their  authorized  representatives  or  by competent  Navy  instrument  repairmen. When  in  the  judgment  of  the  senior  EA  or  the engineering  of!icer  concerned  an  instrument  is  beyond economical  repair,  it  must  be  surveyed  (properly disposed of) by standard survey procedures. Then a replacement instrument must be ordered fkom the Navy supply  system.  Expendable  items  are  procured  in  the same manner. Navy  Supply  System Each individual item of equipment or supply that is available through the Navy supply system is identified by a stock number and listed and described in a stock catalog. Identification of the items that may be drawn from supply by a battalion and the maximum number of each item a battalion may have are set forth in an allowance list. When the number of items available in a battalion  falls  short  of  the  allowance  (because  of expenditure, wear, casualty, loss, or some other type of attrition), the shortage must be replaced. Some items, such as range poles, chaining pins, bull-points,  turning-point  pins,  targets,  stake  bags, equipment boxes, and the like, may be replaced by using the  battalion  or  PWD  shops  personnel  expertise.  Most items, however, are replaced from supply; that is, they are ordered from the nearest available naval supply depot. To  replenish  an  item,  you  must  order  by  stock number and follow a prescribed procedure. To learn the correct procedures, you should get in touch with one of the  supply  petty  officers  in  the  battalion  or  study  the chapters  on  the  Navy  supply  system  in  Military Requirements   for   Petty   Officer   Third   Class, NAVEDTRA  12044,  and  Military  Requirements  for Petty Officer Second Class, NAVEDTRA 12045. NMCB Surveyor’s Kit Every  NMCB  is  properly  outfitted  with  adequate surveying supplies and equipment. These necessary items are listed in the NMCB  Table of Allowance  (TOA) and are contained in Surveyor Kit #80010. For this reason, no attempt will be made to list all the equipment and  supplies  currently  carried  in  the  standard  surveyor kit. Normally, four complete kits will be carried in the battalion  allowance.  They  are  available  for  check-out  to the surveyor section supervisor or the senior EA. It is the responsibility of each survey party chief to make sure that the kit assigned to the crew is complete. The kits  are  required  to  be  inventoried  during  turnover  and at  twice-monthly  intervals  throughout  deployment.  The purpose  of  these  inventories  is  to  ensure  100-percent accountability of the items contained in the kit and to ensure that all of those items are in a proper state of good repair.  Remember,  if  you  have  custody  of  the  kit,  you 6-9