HELP.... Anyone who knows how to operate a dive computer? It's a UWATEC SMART COM dive computer, very, old very ...only used twice, don't have manuel, tried online, so very confusing. I'm trying to sell but I'm being asked if it powers on, don't know how....I'm a female, only used all my scuba gear ( have everything) twice. I bought years ago with old friend who I don't speak with anymore who new how it all works. Any help appreciated. Thank you Cheryl