On the wheel pedestal of my Hunter 34 there is a multi-function display with four separate LED read-outs that show boat speed, wind direction, depth and dist traveled. The LED numerals on the lower two displays are gradually fading. I have been told that if I send the unit in to the manufacturer that they can somwhow "re-charge" the displays. The unit model is stamped NAV 4, but I cannot determine the manufacturer. The boat is a 1985 and I am unsure of the age of the unit. Is anyone familiar with this unit enough to know who the manufacturer is? Or if this can't be determined, could another manufacturer possibly fix the unit?