As soon as you get the 'ship spotted' alert, dive to PD then have the Navigator do a depth setting, you will have an idea what depth you have to play with long before you encounter the ship.
Always try to keep the Sub moving, even if it's only 1kt and if you're in rough weather, have PD at 13/14 metres just so you can get a glimpse of what is happening around you; at 10 metres, you run the risk of exposing the Sub between the 'swells'.
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GWX Team Member; Retired
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