The depths shoal gradually from 21m in the outer anchorage to 10m about 0.2 mile offshore in the area E of the town.
Several rocks, above and below-water, extend up to about 0.3 mile S and SW of Kolachel. Kurusukal, 6m high and surmounted by a white shrine carrying a black cross, lies about 183m S of Kolachel Light.
Ahnakal, 3m high, lies close SSE of Kurusukal, with a rock awash close SE of it.
Pulleri, 1m high, the SE danger in the approach to Kolachel, lies about 0.3 mile SSE of Kurusakal.
Patna Rock and Constance Rock, with depths of 2m, lie about 183m W and 0.5 mile WNW, respectively, of Pulleri.
Storm signals, using the Brief System, are displayed from a flagstaff 0.4 mile E of Kolachel Light.
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