11 HOME : VTAB 6: PRINT "YOU MUST ENTER LONGITUDE AND LATITUDE ": INVERSE : PRINT : PRINT "YOU MAY PRESS <RETURN> FOR PHILA LO & LA": NORMAL : INPUT "LONGITUDE......";LO$:LO = VAL(LO$)
12 IF LO$ = "" THEN LO = 75.16: CALL -998: HTAB 1: CALL -868: PRINT "LONGITUDE.........................";LO
13 INPUT "LATITUDE.......";LT$:LT = VAL(LT$)
17 IF LT$ = "" THEN LT = 40: CALL -998: HTAB 1: CALL -868: PRINT "LATITUDE..........................";LT