9.P.O.29 - APPENDIX TWO - SPECIAL INSTRUCTIONS
1. All enemy forces encountered are to be attacked and
then reported except small patrol craft. Attacking takes precedence over
reporting. Commanding Officers must, however, use their discretion as to
whether to report unimportant enemy units, bearing in mind whether such
a report will facilitate contact by other of our Naval or Air forces,
and whether such a report will betray the presence of the reporting
Submarine and cause a more valuable target to avoid the area. If
warships and transports are encountered together it is more important to
attack transports.
2. Any surface ship, merchant or otherwise, encountered
east of the East Coast Mine Barrier may be attacked on sight.
3. If you have occasion to make any signals while at sea,
you are to include a short weather report in the following form:
(a) Surface visibility in miles.
(b) Proportion of cloud in tenths and height of the cloud base in feet.
4. You are to zig-zag at irregular intervals whenever you
are on the surface by day or by night. Zig-zag diagrams Nos. 31,31 and
32 are to be used.
5. On returning from patrol you are to report your
expected time of arrival at the entrance of the TAY searched channel to
the Naval Officer-in-charge, DUNDEE, Repeated V.A.(S),
Commander-in-Chief ROSYTH, S-9. This signal should be made about twelve
hours in advance, should be amended if it is likely to be more than one
hour wrong, and should be prefixed "Important".
6. Your arrival at the entrance to the TAY searched
channel on return from patrol is to be timed between sunrise and one
hour before sunset.
7. If any shore lights are required for making your
landfall, they should be requested in your E.T.A. signal.
8. The enemy has recently laid ground mines which appear
to detonate by heavy vibration or sudden increase of vibration from
ships passing. You are therefore to proceed on main motors on all
occasions between the LADY BUOY and the Eastern Buoy of Q Z S 162; and
should avoid any sudden burst of vibration such as would be caused by
full speed or going astern.
