If anchoring, select a suitable area considering seaplane movement, water depth, tide, wind, and weather changes. Use an adequate number of anchors and lines...

ATP Airplane ACS › VIII. Postflight Procedures › B. Seaplane Post-Landing Procedures (ASES, AMES)

If anchoring, select a suitable area considering seaplane movement, water depth, tide, wind, and weather changes. Use an adequate number of anchors and lines of sufficient strength and length to ensure the seaplane’s security.