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derstosstrupp 09-26-2019 09:19 PM

OPTIONAL Sea Trial Criteria
The Dive Officer Sea Trials (OPTIONAL)


1. Positions and responsibilities for the Dive Officer on a ‘Standard Dive’.

2. Positions and responsibilities for the Dive Officer on a ‘Standard Surface’.

3. Able to maintain observation scope depth (11.5m) or attack scope depth (13.5m) with an accuracy of ± .2m for 5 minutes.

4. Correct use of dive planes in all situations.

5. Correct usage and knowledge of ballast tanks, vents, negative tank, bilge and compressor.

6. Accurate, timely and useful audible calls and responses. E.g. key depths (7m, 8m, 11.5m, 12, 13.5m, 15m and each major number thereafter), depth callouts and vertical movement (e.g. whether the boat is ‘on the rise’ or ‘descending’).


1. Positions and responsibilities for the Dive Officer on an ‘Alarm Dive’.

2. Positions and responsibilities for the Dive Officer on an ‘Emergency Blow’ surface.

3. Ability to rise or dive the boat with ballast alone.


1. Able to rise or dive with 0 bubble attitude with dive planes alone.

2. Ability to hold depth with 0 speed for 5 minutes with an accuracy of ± .2m.

3. Bottoming the Boat procedures.

derstosstrupp 09-26-2019 09:26 PM

The Radio/Sound Operator Sea Trials (OPTIONAL)


1. Able to differentiate between a warship and a merchant by sound alone.

2. Able to ascertain bearing to a target, and the course required to steer to that target.

3. Able to ascertain relative direction of motion of a target - whether it is stationary, moving away / closer, or its change of bearing and in what direction (clockwise or anti-clockwise).

4. Alert the commander of a new message in an appropriate manner.

5. Understand the difference to ‘Pings in the water’ vs ‘We are being pinged’.

6. Able to use the Hydrophone controls sufficiently to be able to still track warships that are pinging without physical pain or discomfort.


1. Able to pass an accurate position report to another wolfpack member.

It must be in the correct format:

[to - boat id] [from ownship id] POSRPT [map reference e.g. AN4952] BL [Angle from bottom left corner of grid] BR [Angle from bottom right corner of grid] CSE [current course in 3 digits] SPD [current speed expressed as 7PT4 for 7.4kts] AT [time the measurement was taken] in game clock / 24hr time.
E.g. U552 U307 POSRPT AN4952 BL 034 BR 289 CSE 075 SPD 17PT8 AT 230742 END

2. Able to communicate a position report from another wolfpack member to the Navigator in such a way as to enable the Navigator to plot it easily. You will receive one exactly like you send one, so you need to read out each part to the Navigator, as they need it, allowing them to plot it, piece by piece.

3. Reply using standard radio communications language for receipt of messages, requesting of messages, or that an error was sent and to expect a new message.

E.g. MSG RCVD (message received), REQ POSRPT (request position report), DISREGARD LAST STBY NEW MSG (Disregard last message and standby for new message.) Note. All messages should have the correct prefix of [who you are talking to] [who you are] before the message content. E.g CQCQ U307 REQ POSRPT (Attention all boats in wolfpack, this is U-307, we request all boats to give their position reports.) or U552 U307 MSG RCVD (to U552, this is U307, message received and understood).

Post-fix your messages with OVER if you expect a reply or END if you do not.

4. Able to note down (preferably on real paper out of game) the commander’s messages to other boats / BdU, and then afterwards transmit them accurately.

5. Be able to send messages with no more than 1 spelling or layout mistake for the entire checkride, unless immediately spotted and corrected.
Track a depth charge attack and count splashes.


1. Understand and use the Enigma and Radio settings.

derstosstrupp 09-26-2019 09:28 PM

The Helmsman Sea Trials (OPTIONAL)


1. Prompt and correct use of the EoT (Engine Order Telegraph) including the following:
a. When to use SHIFT and when not to use SHIFT.
b. Correct understanding and usage of Both Engines 10 slower.
c. Correct procedures on the dive for switching to Electrics.
d. Correct procedures for switching to Diesels on surfacing.

2. Knowing when, and how to read the battery meter and provide audible updates to the commander. I.e. Whole numbers until 5.0 then every 0.5 until 3, at which point battery management and EoT settings are critical.

3. Be able to maintain an accurate course despite surface wave interruption.

4. Correct “call and response” for all course changes.


1. Knowledge of what speed settings will produce what speeds given ballast, or electric / diesel engines.

2. Ability to hold a steady course with one engine set to Stop.


1. Understanding of using asymmetric thrust and ensuring forward thrust equals reverse thrust. E.g. ‘Full Reverse is actually Great Ahead’.

2. Performance of an “emergency turn” using opposing thrust with both shafts.

derstosstrupp 09-26-2019 09:31 PM

The Navigator Sea Trials (OPTIONAL)


1. Demonstrate how to plot a wolfpack member’s position report.

2. Perform speed / distance / time checks on ownship’s course or a target’s course.

3. Demonstrate how to plot a convoy’s position and determining course and speed via readings from scope, commander’s reports or other means.

4. Demonstrate how to calculate our position report. This must be done in no more than 90 seconds. It is strongly suggested that, for each sub grid the boat will enter on its projected course, the Navigator prepares the two bottom corners with a marker to allow very fast bearing lines to be produced.


1. Know how to give an accurate position report to the Radio officer in such a way as to make it easy for the Radio officer to transmit the message.

It must be in the correct format:

[to - boat id] [from ownship id] POSRPT [map reference e.g. AN4952] BL [Angle from bottom left corner of grid] BR [Angle from bottom right corner of grid] CSE [current course in 3 digits] SPD [current speed expressed as 7PT4 for 7.4kts] AT [time the measurement was taken].

Note that the Radio Officer is responsible for the correct formatting and layout of the message, the bold parts above are the parts the Navigator is responsible for.

Use of the ‘phone’ or ‘number’ pad for position reports is strictly prohibited.

2. Demonstrate how to plot an intercept between two moving targets, one of which will be ownship. (Kreuzeraufgabe)

3. Proper usage and calls with regards to taking depth sounding measurements.


1. An underwater navigation plot, whereby the commander (admin), once upon a steady course, will dive the boat, make a series of turns with no more than 90 seconds between turns, and then after bringing the sub to a complete stop, will surface the boat. The Navigator’s “end” point should be no more than ± 10m of the ships actual position.

2. Thorough knowledge of all the tools in the in-game map.

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