Ok I need a little help with some waypoints. I recently bought a garmin echomap 73sv. I was on google earth earlier and was looking at the lake I fish. Since the lake is down I was marking brush-piles and points of interest. Question is, how can I transfer those waypoints from google earth to my Garmin. Do I have to manually enter each point's long and lat? New to the gps on fish finders, so I'm lost. 

First, download Garmin Homeport software:

 

https://buy.garmin.com/en-US/US/p/64242

 

Then directly import the Google Earth .kmz file into Homeport.  Once the .kmz file is loaded, insert your SD card in the computer, then simply drag/drop this imported .kmz file on the card.  The file will then be saved in .adm (Garmin proprietary format).

Thank you