A group of two ranges, having one of the range marks (either front or rear) in common.
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PUMP SHROUD
The front and/or back of an impeller.
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ALUM
Is an aluminum sulfate or filter alum. Acts in the range of 5.0 to 8.0 pH.
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ISO SOLID CONTAMINANT CODE (ISO 4406)
A code assigned on the basis of the number of particles per unit volume greater than 5 and 15 micrometers in size. Range numbers identify each increment in the particle population throughout the spectrum of levels.
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GROUP REPETITION INTERVAL
The specified time interval of a Loran C chain for all stations of the chain to transmit their pulse groups. For each chain a minimum group repetition interval (GRI) is selected of sufficient duration to provide time for each station to transmit its pulse group and additional time between each pulse group so that signals from two or more stations cannot overlap in time anywhere within the coverage area. The GRI is normally stated in terms of tens of microseconds; i.e., the GRI having a duration of 79,900 microseconds is stated as 7900.
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GROUP OCCULTING LIGHT
An occulting light in which the occultations are combined in groups, each group including the same number of occultations, and in which the groups are repeated at regular intervals. The intervals of light separating the occultations within each group are of equal duration and this duration is clearly shorter than the duration of the interval of light between two successive groups.
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GROUP QUICK LIGHT
A quick flashing light in which a specified group of flashes is regularly repeated
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FORWARD
The front part of a ship.
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GROUP FLASHING LIGHT
A flashing light in which the flashes are combined in groups, each group having the same number of flashes, and in which the groups are repeated at regular intervals. The eclipses separating the flashes within each group are of equal duration and this duration is clearly shorter than the duration of the eclipse between two successive groups.
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GROUP VERY QUICK LIGHT
A very quick flashing light in which a specified group of flashes is regularly repeated.
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GROUP REPETITION INTERVAL CODE
The group repetition interval in micro- seconds divided by 10
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