Surely not everyone here is a newbie. This unit was sold by lowrance from around 1977 to 1983 , a good unit it just needs to be calibrated every now and then, and without the manual it's hopeless. This is a small handheld unit that goes down to 100 ft manually on a hand spool. I troll southern NY resiviors and it's row power only , been doing it that way for about 35 yrs, weapon of choice are homemade rods,7' to 9' ambassador 7000 reels and 18lb test leadcore, 30ft leader of 8lb trilene XL green and miller,sutton and geneava spoons,also rebel J20 plugs in blue back. So its pretty important that i get my Fish n Temp up and running. Any help is most appreciated.