NATURAL PHENOMENA

• Climate.

• Weather: seasonal expectancy and extreme conditions; effects of weather on ships, craft, and working conditions.

• Winds: prevailing and extreme.

• Tide tables.

• Tables of daylight, moonlight, and darkness.

• Star charts.

SHORELINE OTHER THAN BEACHES

• General characteristics.

ANCHORAGES

• Characteristics of sheltered anchorages for small craft and of adjacent beaches suitable for boat maintenance and bivouacs.

EXISTING PORTS

• Evaluation of wharves, docks, unloading facilities, covered and uncovered storage, repair facilities, and routes.

• Availability of native labor.

• Potential capacity and facilities when developed.

CONSTRUCTION MATERIALS

• Actual or potential supply of gravel, timber, and other construction materials.

EXISTING ROADS AND RAILROADS

• Net characteristics.

• Railroad facilities immediately or potentially available.

LANDING BEACHES

• Include for each beach--
  - Exact location.

  - Portions with clear approaches.

  - Bars, reefs, and other obstacles (natural or constructed by the enemy).

  - Gradient of underwater approaches and its effect on the beaching of landing ships and craft.

  - Effect of tides on the width of the beach.

  - Nature of bottom immediately off the beach.

  - Surf.

  - Currents near shore.

  - Physical consistency of the beach; its effect on the movement of personnel and vehicles.

  - Width at all tides.

  - Terrain behind the beach including consistency of the ground, effect on movement, cover, swamps, and bogs.

  - Exits, existing and potential.

  - Water supply.

  - Terrestrial observations over beaches.