Anchor output terminal 1. Here are your electrical connections.

Nr 4278 Marine Rocker Switches With Light Wiring Diagram
Nav light switch wiring diagram. Top row right white stern light and short jumper wire. Just click the wiring diagrams. Navigation light output terminal 3. My switch doesnt have as many terminals and there is only one power wire for the combined anchorstern light. Then when you turn the nav light switch on the nav lights. The section below has wiring diagrams the are specific to marine rocker switch panels.
12v input terminal 2 and 5. Navigation powers the combination light and the stern light anchor powers. Provides power to anchor light when switch is up provides power to both sides of dpdt switch in from backlight circuit to negative from source breaker or fuse to load 2 anc lights to load 1 nav lights external interfaces. On the ops wiring diagram shouldnt either 8 or 9 be identified as stern light. Negative source terminal 7 place jumper between terminals 2 5 and 1 6 see wiring diagram a hard copy of the wiring diagram will be shipped with this switch. If your nav lights are on a separate circuit with a spst toggle the task is very easy.
When the navanc rocker switch is in the up position both the redgreen and the white lights are on. That wire is powered in the navigation and anchor positions of one switch. Fully explained wiring instructions complete with a picture series of an installation and wiring diagrams can be found here in the gfi and light switch area here in this website. Take the ground from the compass light and attach it to the common ground bus under the helm then take the red wire from the compass light and attach it to the post on the switch that has no power when the lights are off and ignition is on. Pin 8 pin 2 pin 3 pin 1 backlight circuit in power in going to loads nav light power switch up. When the switch is in the anchor position you want only the white stern light to be on.
From the back this switch will have three rows of terminals with two terminals on each row. We have wiring diagrams and wiring guides on how to wire a 10 terminal navancher on off on 3 way carling contura rocker switch as well as a wiring diagrams in how to wire a 10 terminal bilge auto manual on off on 3 way carling contura rocker switch for more on how to wire a bilge pump check this out we also have a general dpdt wiring diagram for powering two loads using an on off on 3 way carling. Top row left no connection. A red and green forward navigation light and a white stern or high point light. This nav anc rocker switch has 7 terminals on the back. As you said when the switch is in the navigation position you want the redgreen light and the white stern light to be on.