Raymarine GPS Plotter Owner's Handbook Manual page 44

Chapter 3: Operation
Note: You can enter Waypoints as Loran TDs which are converted to
Lat/Long coordinates. You can subsequently only edit their positions as
Lat/Long coordinates.
3. Edit the Loran parameters as required, using:
WPT POSITION (LORAN TDs)
Figure 3-20: Waypoint Position Screen (Loran TDs)
i. the CHAIN soft key, which enables selection of both the Chain and
it's Slaves, see Figure 3-21;
Press ENTER to accept the changes (or CLEAR to cancel the
changes); the display returns to the Waypoint Position Screen.
WPT POSITION (LORAN TDs)
Figure 3-21: Select Chain/Slaves Screen
ii. the ASF1/ASF2 soft key, which presents two soft keys for editing
ASF 1 and ASF 2 parameters independently , see Figure 3-22;
Press ENTER to accept the changes (or CLEAR to cancel the
changes); the display returns to the Waypoint Position Screen.
Figure 3-22: ASF 1/ASF 2 Soft Keys
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