Furuno NAVNET TZ2 TZTL12F Operator's Manual page 122

You can see the number of catches you have logged on the [DATA USAGE] section
in the [General] menu. In the example below, two catches have been logged out of
1000.
4.2.3 How to enter an event mark at a specific location
You can enter an event mark at a specific location on the fish finder display.
1. Tap the location on the fish finder display where to enter an event mark.
The pop-up menu appears.
2. Tap [New Point] on the pop-up menu.
The [Creating Events] window appears. See section 4.2.2.
3. Select an event mark.
The event mark is put at the location selected at step 1 and the point is saved to
the [Points] list. The event mark appears on both the fish finder and chart plotter
displays. However, the name of the event mark does not appear on the fish finder
display.
4. POINTS, BOUNDARIES
4-5