MAXIMUM POSSIBLE VISUAL SIGHTING TABLE
Ht      VHigh High Med Low Vlow       LrgShip MedShip SmShip Periscope
VHigh 521      434   332  290   270         269       267         266       261
High    434      345   243   181  164         180       178        177        173
Med    332     243     143  101   81          80        77           76          72
Low    290      181    101  59    38            37        35            34         30
Vlow   270     164     81  38    19             17          15           14        10

Large  269     180     80  37    17             19          17            15         11
Medium 267    178    77  35    15             17           14           12          6
Small    266     177    76  34    14             15           12           10          5
Peri     261      173    72  30    10             11           6              5          1