. Collected reprints, Essa Institute for Oceanography. Oceanography THE TIDE GAGE. Figure 2.—Receiver, or recorder, and power supply units of remote recording system. recorders are in use at many tide stations in the Warning System network. Their use eliminates the necessity of visiting gage sites to visually inspect the tide record, or marigram. This reduces the hazard to station personnel and the time required in responding to requests for wave reports. Remote recording systems also provide readily available wave information of use in determining the time to safely sound the &q
. Collected reprints, Essa Institute for Oceanography. Oceanography THE TIDE GAGE. Figure 2.—Receiver, or recorder, and power supply units of remote recording system. recorders are in use at many tide stations in the Warning System network. Their use eliminates the necessity of visiting gage sites to visually inspect the tide record, or marigram. This reduces the hazard to station personnel and the time required in responding to requests for wave reports. Remote recording systems also provide readily available wave information of use in determining the time to safely sound the "all clear" following tsunami warnings or the passage of seismic sea waves. It also is possible to telemeter wave information—from the gage site—over long distances by using radio (microwave) frequencies, instead of "hard ; Care of gage Every effort should be made to keep the tide gage performing satisfactorily and to correct operating difficulties promptly. All tide station personnel with responsibility for answering requests for tsunami data should understand the operation of the tide gage sufficiently to make emergency repairs. Instruction in the care and operation of tide gages is given in the Manual of Tide Observa- tions, Coast and Geodetic Survey Publication 30-1, 1965, a revision of Special Publication No. 196. Accurate time It is especially important that accurate time be kept at tide stations partici- pating in the Warning System network. Before each daily visit to tlie tide gage, the observer should check the time of his watch with that of the radio, the local communication station, or any other reliable source so that the time of the gage clock can be kept as accurate as possible. Legibility of record The graphic record should be kept clear and distinct at all times. This will facilitate interpretation of the record in time of emergency. This also is im- portant in providing good photographs of the record. The observer should
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