It really depends on alot of variables. if your in a 688 and hear pings from a surface ship but have nothing on sonar. You might want ot get an ESM cheak. If you catch him on ESM and still have no sonar contact Its safe to dive a bit and run fast and then go for another ESM cheak. That way between the pings and ESM you can get a good idea of were he is. If you have a faint contact on your TA and nothing on your sphear? Its safe to run at a faster speed to get a better cross bearing or closer to the target to try and catch him on your sphear also. When i say run faster i mean about 10-12 knots. Slowing to 4-6 knots. Again it dependes on your target. If you know your hunting a Kilo wich is very silent. Your faint signal on the TA may not mean he is far away. So a constant speed of 4-6 knots with course changes would be the safe bet. It all comes down to knowlage of your ships sensors, Knowlage of your enemys capabilitys, Understanding the inviorment, The info provided in the mission briefing and you gut feeling.
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