Is it an HD5 Gen 2? The Gen 2, you have to go into the settings and select the type transducer you have on it and then select salt or fresh water and the usual water depth you use it in!If you tell me what model you have, maybe I can go to the LORANCE site and cut and paste you the instructions.
justretired, don’t know if this will help but you can use it to set your transducer up! Maybe you can get someone with a good printer to print it out for you. Or you can order another manual?