E series has a feature to dim the night screen
. Check me but I think you push the on off button and then there is a bar graph showing the intensity and you can dial it down using the round nob that turns. You can dial it down to a dark blac screen and then dial it up a little to see.
I may catch a lot of flack but I would tend to set way points for my trip down in the day light and use autopilot
to steer the route
back at night. You still must be very cautious but you can put your attention to sighting. Or you can make a track on the way down and then follow your track. You know you were in safe water
making the trip down.
If looking for markers at a great distance, you can use your binoculars and spot light. Shine the light toward where you think the mark is. You will not be able to see the mark with your naked eye but will be able to see the reflective marks and numbers using the binoculars. If you want to get fancy, put your curser on the mark on the chart. It will read the bearing and distance to the marker. Use binocs with a compass
and you can look at the same bearing. If you can not identify the mark numbers but it is on the same bearing as the mark on the chart plotter and the appropriate distance you might be more comfortable that it is the mark you are looking for.
You may have to trust your instruments more than you want.
Take everything I say with a grain of salt
. It is just my opinion and I am a beginner