Lets hope they don't have depth charges!

No thay just have lazers.:lol:

I heard some aliens in SH3! :)

I think that the slight color variances all over the map are meant to show that it has been creased and left in a high-humidity environment. That will leave paper wrinkled and unable to sit flat on the table, so there will be slight shadows on parts of the page. Silent Hunter III did much the same thing, but the creases were positioned in a fixed position, relative to your eye, rather than relative to the map, so when you dragged the map around the table, the creases didn't move with the map, like they should have.

Methinks the Roswell aliens landed in Germany years before the crash in New Mexico but didn't leave anything behind nearly as useful as the velcro the Americans picked off of Little Gray's rotting carcass.

Strapped to there friggin heads ? ! :yep:

Can you find support for this, because I'm dubious. My understanding is it can take 30 minutes or more to fully acclimate your night vision, and in wartime steaming why take the chance on having to wait 30 minutes if some need to look around at night suddenly comes up (potential target or emergency). If you were sure you wouldn't need night vision on short notice I could see this, but what captain could be that sure?

Certainly on surface I'd question any sub running with normal lights inside. We always set night time lighting on surface ship, and a WWII sub was nothing much more than a small surface ship that could submerge part of the time. Sub isn't big enough to isolate your watch reliefs to allow night vision to fully acclimate, easier to darken ship.

Again, my brief (overnight on USS Gurnard) at sea experience on a modern US Navy sub confirms this is done, and part of the reason is to keep some sort of reference fram on real world.

This comes from the Feet Submarine Manual, in the section about duties of the CPO of the Watch:

And farther down, in the same section:

Paper folds
 

As mentioned previously the light and dark aspects of the map page, at least to me, where simply there to simulate creases in your map chart. I've found no correlation between these shaded areas and time of day. One thing I have noticed however is the time of dawn and dusk once I get near japan whereby dawn can be close to 10am and dusk damn near midnight in some cases!!:-? I know there's DST etc and I don't have any real life exposure to that end of the world but the dawn and dusk timings seem a bit strange sometimes.

Ref red lights, we still use red filters on flashlights at night to maintain night vision "in the bush". There's a good episode of Mythbusters which investigates this type of thing, it was their "pirate myths" episode. Supposedly one myth states that the famous pirate eyepatch was not from wounds but a method of keeping one eye ready for night vision by keeping it covered!!:arrgh!:
;)

Paper folds
 

As mentioned previously the light and dark aspects of the map page, at least to me, were simply there to simulate creases in your map chart. I've found no correlation between these shaded areas and time of day. One thing I have noticed however is the time of dawn and dusk once I get near japan whereby dawn can be close to 10am and dusk damn near midnight in some cases!!:-? I know there's DST etc and I don't have any real life exposure to that end of the world but the dawn and dusk timings seem a bit strange sometimes.

Ref red lights, we still use red filters on flashlights at night to maintain night vision "in the bush". There's a good episode of Mythbusters which investigates this type of thing, it was their "pirate myths" episode. Supposedly one myth states that the famous pirate eyepatch was not from wounds but a method of keeping one eye ready for night vision by keeping it covered!! I know in the military it's common to be told to close one eye at night when a light source appears in order to keep your night vision.:arrgh!:
;)

:lol: :lol: :lol: ..well we must have diffent games then 'cause mine changes to red while it is still broad daylight up on deck...guess that could be termed a rough indicator if by that you mean it is 3 hours to nightfall...:shifty: ...and as I said already ..it makes very little sense to rig for red while it is still daylight...irregardless of what the "book"calls for.

Are you certain the charts were paper? ..folded paper?

I have an actual one in my collection ...and it is printed on silk, rolled up silk at that..not folded. I assume silk was used to resist rot and mildew better than paper in warm ,humid, tropical conditions..like one would find in a submarine operating in the PTO.

I'll say it again...these dark...and light areas are not static.They change. Look at the screenies I posted. There must be a reason for the change.

My suspicion now is that they correlate to weather conditions. More investigation is required.My opinion is subject to change depending on developments.