While the recording is playing back on the unit...you can also mark waypoints off to the side in the SI image playback..

*Press Menu to stop the SI image screen scroll and activate the cursor..
*Use the 4way cursor to move the cursor to an interesting item on the SI image...
*Press the "Mark" button...

This will save a waypoint at that exact spot (where your cursor is)...on the lake where you made the recording...(if your screenshot feature is still turned on, the unit will also save a screenshot to the SD Card)...

(mark everything interesting in the SI image playback...and then verify those interesting things the next time you're on that part of the lake)

Rickie