Nested IFs won't work.
You have to either use
code:
IF $LOC >= "M74" AND $LOC <= "M88"
ELSE
  IF $LOC >= "M130" AND $LOC <= "M144"
  ELSE
    IF $LOC >= "M146" AND $LOC <= "M160"
    ENDIF
  ENDIF
ENDIF
or preferably
code:
SELECT
CASE $LOC >= "M74" AND $LOC <= "M88"
CASE $LOC >= "M130" AND $LOC <= "M144"
CASE $LOC >= "M146" AND $LOC <= "M160"
ENDSELECT
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There are two types of vessels, submarines and targets.