Real Navigation and the sextant

[Gauthier]

Thank you very much for the help.
I'll wait this tutorial for celestial lop.

But afaik, my "sextant-stadi" can't measure more than a 16 deg angle or so.
Maybe he did with the lower stars?
Or is it possible to go higher?
Tks a lot.

[Gauthier]

I didn't see screenshots... I'm glad to see you are on the way...

[Sjizzle]

Yup can't measure higher then
16 degree u must use some lower stars ... Capella some stars from big deeper etc
Polaris its to high..
And what is sad star almanac are not free ...there are
Some internet page with star almanac
my tutorial is almost done

[Gauthier]

Couldn't we use a mask in the obs that can point up sky? Or older version of sextant (red lines across full screen) (that I can't activate now)?

I'm in a hurry to try your tutorial...
Thank you.
G

[vdr1981]

Ahhh, celestial navigation...My ultimate goal in SH series... To sail from Kiel to France (or even further ) without any help. Cant wait for your tutorials Sjizzle,tnx!

[Sjizzle]

Originally Posted by Gauthier

Couldn't we use a mask in the obs that can point up sky? Or older version of sextant (red lines across full screen) (that I can't activate now)?

I'm in a hurry to try your tutorial...
Thank you.
G

the old sextan from TDW_UI's 742 work great u can mesure all stars ...

[Mudraxus]

Hello Kameraden!

I downloaded the TDW mods, including Real nav a couple of days ago, and did quite some research on Nautical navigation. But I ran into two Problems.

Following Situation. I'm enroute from Helgoland to Scapa Flow. I have a rather accurate DR Fix (done by myself) and find myself around 55°48N' 3°46'E . One would expect that the sunset and rise is round about 16 minutes earlier on the GMT Clock than it's stated in the Almanach Table or the Shift-B Board. But the SH5 Reality is, that these events are happening over an hour after the times, putting me in the Atlantic instead of the North sea.

Second Problem, shooting Stars with the Sextant (The Red Vertical thingy) . I have a Free Sextant Calculation App for my android Phone, so I punched in three Stars, (Polaris, Mirach and Dubhe) and the App told me I was over 1000 nm SW of my Current Posit. At the same Time I was looking up the exact situation at Stellarium and I figured out that there seem to be Errors between 12 and 5° on the measurements in SH5.

So my question is, is it even possible to get a somewhat accurate Fix without the aid of the Navigator? Are those Angle errors real or do I just make some stupid mistake? And if there are errors how to Correct for them?

Thanks!

Ps. If you wanna try to calculate here are the numbers
DR: 55°48N' 3°46'E 8. Oct 1939 18:40
Polaris measured Angle: 49°50'
Mirach: 17°55'
Dubhe: 32°40'

[gap]

Originally Posted by Bothersome

My guess is that the game knows your exact location but when asked, it puts a random figure into it to make it off some, instead of best guessing.

If memory serves me well, this is exactly how TDW implemented his DR/CF code: random deviation from the real (hidden) position. Ocean drifts are not modelled in game. Course deviations and speed drops are, but they are not considered for position fix calculations.

Originally Posted by Bothersome

Especially, DR has too much course deviation. 90 degrees west is pretty damn close to 90 degrees west. 18 knots is pretty damn close to 18 knots, so travel for 10 hours west is not going to be off by 5 degrees and not away from target by more then a few kilometers. But DR can be off by way more than that. Like some first grade schooler done the figuring.

There should be an user option, accessible through New UI's options editor, for adjusting the maximum percent of deviation.

Originally Posted by Sjizzle

my tutorial is almost done

Any news on it?

[Gauthier]

Originally Posted by Sjizzle

my tutorial is almost done

Hello,

any news?
G

[Gauthier]

Hello,

any news?
Tks a lot.
G

[Examiner2]

Is there any news on tutorials on how to calculate your position without using the navigator? I've been trying to search and learn how to calculate my position celestially and with dead reckoning. Are there any tutorials on how to do this?

[THE_MASK]

Originally Posted by Examiner2

Is there any news on tutorials on how to calculate your position without using the navigator? I've been trying to search and learn how to calculate my position celestially and with dead reckoning. Are there any tutorials on how to do this?

http://www.subsim.com/radioroom/show...3&postcount=34

[Examiner2]

Originally Posted by sober

http://www.subsim.com/radioroom/show...3&postcount=34

Thanks for the link but this isn't something that could help me yet. I'm looking for more of a real-nav for dummies kind of thing. I know absolutely nothing about marine navigation, so I need an in-depth tutorial on these things.

I did find a supplemental manual in the realnav folder "The Mathematics of The Longitude" which seems to have the information that I would need.

One last question, how do you bring up the sextant tool in-game? I'm using sober's mod list.

[THE_MASK]

Originally Posted by Examiner2

Thanks for the link but this isn't something that could help me yet. I'm looking for more of a real-nav for dummies kind of thing. I know absolutely nothing about marine navigation, so I need an in-depth tutorial on these things.

I did find a supplemental manual in the realnav folder "The Mathematics of The Longitude" which seems to have the information that I would need.

One last question, how do you bring up the sextant tool in-game? I'm using sober's mod list.

Use the options editor and enable the officers panel .