Should the commander call also for recommendations as to the decision or decisions to be made, the appropriate members of the staff will be prepared to submit their views. They will be prepared, as well, to answer at any time the calls of higher authority for information, for the conclusions of the commander, or for his recommendations. Should the commander have no staff for the performance of the foregoing functions, such detailed duties devolve upon him personally. Certain further aspects of estimates of the situation, with reference to the circumstances obtaining during the supervision of the planned action, are noted under the discussion of written estimates, which follows. Written Estimates. The foregoing remarks as to oral estimates are no less applicable to those submitted in written form, whether formal or informal, partial or full, brief or detailed. The nature of an estimate, as to these characteristics, will largely depend on the time element. A long and detailed estimate, often desirable when time is available, may be wholly impracticable when the press of events requires rapid decision. The written estimate, even if informal, partial, or brief, would frequently be out of place in situations where an oral estimate would be adequate or, if not adequate, would be all that could be accomplished under the circumstances of the case. Special Remarks as to Entries Entries on Charts. Entries on charts are made by the usual conventional signs and symbols. Colors are employed where appropriate. Information not yet confirmed is indicated as doubtful; e.g., by a question mark. Special remarks, comments, or other notations may also be entered, but in such a manner as not to obscure other data on the chart. Where operations of land forces are involved, maps are prepared by the methods prescribed for own land forces. The higher naval staffs, or those of forces specially designated for such operations, may include army officers who will look after these matters; marine officers may also be assigned such duties. Special charts or maps are those prepared for special purposes. A chart (or map) maintained to show the existing situation is known as a "situation chart" (or map). Charts (or maps) prepared for particular operations are known as "operations charts" (or maps). Entries in Journals. Entries in journals, already referred to, are purely factual. Such entries may be complete copies of the content of incoming or outgoing orders or messages. Again, as already indicated (page 209), entries may consist of condensations of such matters. The oral instructions of the commander are also appropriate items for entry, when the matter is of sufficient importance. The journal may also make note of the movements of the commander, his staff officers, and other persons. Other pertinent happenings may also be made the subject of entry.