For best sonar log recording, we suggest you keep your speed under 6 knots, although maximum logging speed may vary depending on which device you are using; perform a grid pattern where the distance between tracks is no more than 50 meters /150 feet; and save about every 30 minutes to reduce any risk of loss.
Tap Nav Info
Tap Tracks
Tap Active Track Options
Tap Record Mode
Tap Fill
Tap Record Interval
Tap Interval
Tap Time
Tap Change
Set Time Interval to 1 second using the arrows, then tap Done. Now tap HOME to go to the main menu and start boating (at this point you are recording the log)
At the end of the trip, make sure the MSD/SD card is inserted into your GPS chartplotter, then tap Nav Info
Tap Manage Data
Tap Data Transfer
Tap Card
Tap Save to Card
Tap Add New File
Assign a name and tap Done