ESM Range Target VHigh High Medium Low VLow Large Medium Small Peri- Observer Alt Alt Alt Alt Alt Ship Ship Ship scope ---------------------------------------------------+--------------------------- VHigh Alt 770 639 490 428 398 | 400 398 396 386 Hight Alt 639 509 360 298 268 | 270 268 265 255 Medium Alt 490 360 211 148 119 | 121 119 116 106 Low Alt 428 298 148 86 57 | 59 56 54 44 VLow Alt 398 268 119 57 27 | 29 27 24 14 -----------------------------------+--------------------------- Large Ship 400 270 121 59 29 | 31 29 26 16 Medium Ship 398 268 119 56 27 | 29 26 24 14 Small Ship 396 265 116 54 24 | 26 24 21 12 Periscope 386 255 106 44 14 | 16 14 12 2 Radar Line of Sight Target VHigh High Medium Low VLow Large Medium Small Peri- Observer Alt Alt Alt Alt Alt Ship Ship Ship scope ---------------------------------------------------+--------------------------- VHigh Alt 700 581 446 389 362 | 364 362 360 351 Hight Alt 581 463 327 271 244 | 245 243 241 232 Medium Alt 446 327 192 135 108 | 110 108 105 97 Low Alt 389 271 135 78 51 | 53 51 49 40 VLow Alt 362 244 108 51 24 | 26 24 22 13 -----------------------------------+--------------------------- Large Ship 364 245 110 53 26 | 28 26 24 15 Medium Ship 362 243 108 51 24 | 26 24 22 13 Small Ship 360 241 105 49 22 | 24 22 19 11 Periscope 351 232 97 40 13 | 15 13 11 2 Visual Line of Sight Target VHigh High Medium Low VLow Large Medium Small Peri- Observer Alt Alt Alt Alt Alt Ship Ship Ship scope ---------------------------------------------------+--------------------------- VHigh Alt 525 436 334 292 272 | 273 271 270 263 High Alt 436 347 245 203 183 | 184 183 181 174 Medium Alt 334 245 144 101 81 | 82 81 79 72 Low Alt 292 203 101 59 39 | 40 38 37 30 VLow Alt 272 183 81 39 18 | 20 18 16 10 -----------------------------------+--------------------------- Large Ship Brdg 271 182 80 38 17 | 19 17 16 9 Medium Ship Brdg 269 180 78 36 15 | 17 15 14 7 Small Ship Brdg 267 178 77 34 14 | 15 14 12 5 Periscope 263 174 72 30 10 | 11 10 8 1 Name Height Name Height Name Height ------------------------------------------------------------------------- VHigh Alt 24700 Large Ship 40 Large Ship Brdg 25 High Alt 10800 Medium Ship 29 Medium Ship Brdg 14 Medium Alt 1850 Small Ship 19 Small Ship Brdg 8 Low Alt 310 Periscope 0.15 VLow Alt 30 Sighting distances in nautical miles. Heights in meters.