From DW manual:
Quote:
Depth: Set the depth at which the weapon travels.
Ceiling: Set the depth above which the weapon does not travel.
Floor: Set the depth below which the weapon does not travel.
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It means torpedo will ignore all targets above ceiling and below floor.
It doesn't means torpedo will continuously change depth from ceiling to floor and vice versa.
But if target detected between ceiling and floor, will go for example deeper, torpedo will follow this target.
BTW in DW torpedo travels at your sub launch depth until manual activation or reaching RTE. After this point torpedo change depth to value from pre-launch settings (depth).
Ceiling - discriminates all targets above (useful if you don't want to hit civilian or allied ships)
Floor - discriminates all targets below.
In RA ceiling can active additional modes of engaging:
1. ASW+ASuW
2. ASuW only
3 ASW only
Floor changes search pattern.