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Group 1: Generally, Group 1 is set up by the distributor and
contains information defined by the part number. However,
although functions are defined here, do not change them without
proper knowledge or they will affect performance of the indicator.
Group 2: Group 2 must be set up by programming the unit in
Manual Entry Mode. Group 2 settings allow the user or installer to
change Loran or GPS input and output parameters, endurance
warning time, and fuel flow filtering types.