Before updating device software, it is recommended that you back up user data like waypoints, routes, and tracks. This should be done at regular intervals to provide a good database in case the loss of user data occurs. Backing up the data also provides the ability to edit the information and send it back to the device.

Requirements

A free Garmin marine trip planning software called HomePort
A blank SD card, 32GB or smaller
An SD card reader for the computer

Backing up data from a 7xx device

Insert the SD card into the chartplotter
Power On the chartplotter
When the Home screen appears, choose Information
Select User Data or Nav Info
Select Manage Data (7x1/7x2 only)
Select Data Transfer
Select Card
Select Save to Card
Select a file from the list, or select Add New File
Select Save to Card

At this point, the user data will be backed up to the SD card.

Viewing and backing up the data to a computer

Windows

This will copy the user data from the SD card directly to the computer and automatically save it in the My Collection folder.

MAC

Connect the SD card reader to the computer
Insert the SD card into the SD card reader
Open the HomePort program
On the left side of the program, the GPS device should be listed
Below the device should be a folder called USERDATA or Untitled, the default names given to the file for the waypoints that were backed up.
Control+Click on the USERDATA folder
Select Receive from Device
Select Receive
Click Close

This will copy the user data from the SD card and save it within my collection.