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With the efficiency of Leds these days it would be very easy to install a strobe led on top of a pole/antenna.
This would use next to no power and be visible for miles, {night time}. Today you...

Best book in vic ever printed was the ES map book , but no longer published. as above by all means use your gps but back it up with paper maps every outback trip.
Don't know if everyone knows but...