I have a Garmin GPSMAP 78s. I purchased the Garmin classic e-card map for my area. The instructions say to turn my unit on first, then insert the card. First off...this is impossible as the card slot is under the batteries. So, I just insert the card then turn on unit and hit menu twice and enter setup...then go to setup and go to map. I'm not seeing anything from my new card. No maps to import or select or anyrhing. Any idea of what I'm doing wrong? The instruction card says hit the home button which I do not have and days under charts, select fishing charts which I also do not see. Thinking I need to send this back.