- 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.
- Characteristics of sheltered anchorages for small craft and of adjacent beaches suitable for boat maintenance and bivouacs.
- Evaluation of wharves, docks, unloading facilities,
covered and uncovered storage, repair facilities, and routes.
- Availability of native labor.
- Potential capacity and facilities when developed.
- Actual or potential supply of gravel, timber, and other construction materials.
EXISTING ROADS AND RAILROADS
- Net characteristics.
- Railroad facilities immediately or potentially available.
- 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.
- 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.
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