pmaidhof Posted July 2, 2007 Report Share Posted July 2, 2007 I'm about to play my first scenario this weekend using thePlotter - Canadian ASW frigates vs Soviet SS in the North Sea.How did it go. We eagerly await an AAR, however brief. Quote Link to comment Share on other sites More sharing options...
pmaidhof Posted July 2, 2007 Report Share Posted July 2, 2007 Here is the best free source, that I've found so far, of relative ocean depths in the proposed area of operations. It appears from this that aside from a small very shallow band along the coast, that most of the AO (labelled Bonaire Basin in this graphic) is between 200-1,999 meters. Therefore it would appear to me, per 3.2.1 Depths and Depth Changes, that this would provide for the use of Towed Arrays, and the appearance of one Convergence Zone of 3nm at a range of 30nm from the sonar. Quote Link to comment Share on other sites More sharing options...
pmaidhof Posted July 2, 2007 Report Share Posted July 2, 2007 This is where solo gaming becomes a challenge, but I'll roll some dice, or select some pre-written out standing order cards to determine what depth the sub is at, along with my pre-rolled "start" bearing of the sub in relation to the FFG's position. I created six pre-written standing order cards for the Amur. These addressed aggressiveness/timidity of the CO, above/below the thermocline, at/not periscope depth (if applicable), whether attack or evade upon detection. I shuffled and then selected "An aggressive commander, above the thermocline, at periscope depth, and he will evade if detected unless the detecting platform is his primary target." This means that the Amur is trying to get past the screening Perry and onto the maritime inspection force - currently a Burke. Quote Link to comment Share on other sites More sharing options...
pmaidhof Posted July 3, 2007 Report Share Posted July 3, 2007 USS Carr (FFG-52) is on ASW Picket duty, screening between Isla la Tortuga and the isthmus north of Cumara. USS Shoup is conducting maritime inspections just north of Isla de Magarita. The Venezuelan Amur SS begins off of Cumara after transiting along the coast from its port in Puerto Cabello. Amur begins at periscope depth 25m. She has an aggressive commander, who will evade unless it is his primary target – the DDG. Amur and Carr begin 48.7nm apart. Sea State 4 0801-0830 Amur SS 315 @ 10kts Perry FFG 095 @ 10kts 40.7nm apart 0831-0900 Amur SS 000 @ 10kts, descends to Intermediate I Depth Perry FFG 095 @ 10kts 32.7nm apart 0901-0930 Amur SS 030 @ 10kts Perry FFG 095 @ 10kts 28.2nm apart 0931-1000 Amur SS 075 @ 10kts Perry FFG 095 @ 10kts 28.2nm apart 1001-1030 Amur SS 075 @ 10kts Perry FFG 095 @ 10kts 28nm apart 1031-1100 Amur SS 050 @ 10kts Perry FFG 095 @ 10kts 27nm apart 1101-1130 Amur SS 050 @ 10kts Perry FFG 095 @ 10kts 25.5nm apart 1131-1200 Amur SS 090 @ 10kts Perry FFG 095 @ 10kts 25.6nm apart SS is negotiating the area between Margarita and the isthmus near Cumana and the two islets in between. 1201-1230 Amur SS 090 @ 10kts Perry FFG 185 @ 10kts (accelerated in order to maintain speed in light of turning more than 45 degrees.) Burke DDG 135 @ 5kts current position 11.05.33N 63.47.41W (been patrolling, just not reported) 1231-1300 Amur SS 045 @ 10kts Perry FFG 230 @ 10kts Burke DDG 135 @ 5kts 20.2nm apart (SS and DDG) 1301-1330 Amur SS 045 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts 13.2nm apart (SS and DDG) 1331-1400 Amur SS 045 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts 9.2nm apart (SS and DDG) 1401-1430 Amur SS 030 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts 3.1nm apart Detection pre-work up Amur's LIRA LF-MF in Passive has a 50% Range of 3.0nm Target Noise: x1 Quiet Target Speed: x1 5kts Own Speed: x.5 10kts Sea State: x1 SS4 (ignored since own speed modifier is lower) Cross Layer: x.5 Sub at Intermediate I 51m+ 0.75nm x 0.40 = 0.3nm @ 75% 0.75nm x 1.1 = 0.8nm @ 50% 0.75nm x 1.5 = 1.1 @ 25% Burke's SQS-53C @ 5kts Passive rating of 3.0nm Target Noise x.5 VQuiet Target Speed x2 10kts Own Speed x1 5kts Sea State x1 (ignored) Cross Layer x.5 1.5nm x 0.40 = 0.6nm @ 75% 1.5nm x 1.1 = 1.7nm @ 50% 1.5nm x 1.5 = 2.3nm @ 25% 1431-1433 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts 2.9nm apart 1434-1436 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts 1.9nm apart Burke attempts detection: 2D10 = 21 CONTACT! Bearing 205 degrees. Burke attempts classification: Base LF-MF vs VQuiet = 0 Target Speed (10kts) Base +5 Tac Turns in contact = Base = 0 Need <=5; 2D10 = 89 No classification 1437-1439 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts 1.4nm apart Burke orders Alert5 MH-60R to launch at 1441 on most recent bearing. Burke attempts to maintain contact (+15% per 4.4.3): 2D10 = 55 CONTACT! Bearing 224 degrees! Attempts classification: Needs <=10; 2D10 = 19 No classification. 1440-1442 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts MH-60R launches at 1441 travels at 100kts, at Low Altitude. Travel 1.0nm drops 1x DICASS (P) Set for “Below Layer”. Turns to a heading of 315 degrees and drops 1x DICASS every 0.5nm for a total of 10x DICASS Sonar Buoys. Burke attempts to maintain contact: 2D10 = 39 Contact maintain, Bearing 253 degrees. Burke attempts to classify contact: needs <=15; 2D10 = 22, no classification SB #2 is at/within 1.0nm, which is within the 50% band. Attempts detection; 2D10 = 30. SB #2 Classification attempt: 2D10 = 40 = no classification. 1443-1445 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts Burke attempts to maintain contact: 2D10 = 85 CONTACT LOST! MH-60R, drops SB#10 and then turns returning to SB#2. SB#2 attempts to maintain contact: 2D10 = 78 CONTACT LOST! Amur attempt detection of potential target of 1.1nm: 2D10 = 76 No contact. 1446.0 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts MH-60R dips its AQS-22F Active Dipping Sonar into the Shallow Depth Band 1446 Detection: Amur cannot attempt detection of potential target. Amur's LIRA LF-MF in Passive has a 50% Range of 3.5nm (Flank Array) Target Noise: x1 Quiet Target Speed: x1 5kts Own Speed: x.5 10kts Sea State: x1 SS4 (ignored since own speed modifier is lower) Cross Layer: x.5 Sub at Intermediate I 51m+ Engagement Turns x.5 0.44nm x 0.40 = 0.18nm @ 75% 0.44nm x 1.1 = 0.44nm @ 50% 0.44nm x 1.5 = 0.66nm @ 25% Burke attempts to re-detect contact: 2D10 = 03 CONTACT Bearing 290 degrees. Burke attempts to classify 2D10 = 69 no classification. 1446.5 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts MH-60R continues to dip the active sonar from Shallow to Intermediate Depth. 1447.0 Amur SS 000 @ 10kts Perry FFG 275 @ 10kts Burke DDG 135 @ 5kts MH-60R – Hovering 1447 Detection AQS-22F Active Rating 4 Speed (0) x1 Sea State (4) x1 Anechoic Coating x.5 Engagement Turn x.5 0.4nm @ 25% 1.1nm @ 50% 1.5nm @ 75% Range 2D10 = 26 Contact! Bearing 350 degrees, Range 0.5nm Amur cannot detect due to Passive Sonar Engagement Turn Factor rendering a too short range. What now El Captain? Quote Link to comment Share on other sites More sharing options...
pmaidhof Posted July 5, 2007 Report Share Posted July 5, 2007 I intend to back up to 1434-1436, have the sub at 5kts, and back up at at periscope depth to see if it has a better chance at passive detection, or even a visual detection in the next couple of turns. We'll see how that works out. Quote Link to comment Share on other sites More sharing options...
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