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Tracker500/500i User Manual16
over which the average is taken. Usually a value of 10-15 seconds will give a satisfactory
result for a carburettor engine. Fuel injected engines may require a larger value. Too high
a flow filter value will slow down the display of real changes in flow rate when you change
the throttle setting. This setting does not affect the fuel volume measurement, only the
display of the flow rate.
Economy and speed
As the speed error caused by Selective Availability becomes significant at low boat speeds,
the economy rate is not displayed for speeds of 5 knots or less. If the Tracker500i is receiving
corrections from a differential receiver, the economy rate is displayed whenever the boat
speed is above 1 knot.
The Tracker500/500i indicates speed over the sea bed. A speed/log instrument indicates
speed through the water. If there is any tidal current, these two will be different.
9.1 Fuel used reset
This resets the fuel used figure to 0.0.