in the aeration system configuration of fig4 but which will be described below for an alternate configuration and so skips through this diamond in this fig4 configuration to a further process 202 to switch off electrical power to or deactivate pump operating circuit 58 to thereby stop any further pumping by aeration pump 6 of water into livewell tank 7 and so also end the drain on the charge left in battery 1 that results from such pumping the micro continues by proceeding to a decision diamond 187 in fig9 concerning operation of a tank drain arrangement which is not present in the aeration system configuration of fig4 but which will be described below for an alternate configuration and so skips through this diamond in this fig4 configuration to a further micro input process 188 in that figure there the micro again acquires the input signals from pots 46 48 and 50 as well as the input indicating the status of ignition switch 4 and again measures the voltage being supplied by battery 1 the micro then enters a further evaluation process 189 to recalculate the operation time durations in the manner previously described above in connection with micro processes 183 and 184 to update them on the possibility of the user interactive inputs having been changed the micro then proceeds to a further decision diamond 190 to compare whether the timer register count accumulation value of the counter corresponding to the off time matches the count set for the off time last calculated in process 189 based on the wiper position then of pot 48 as the basis for determining whether.