How to use the sextant / stadimeter ??
 

How do I use the sextant / stadimeter on board ??

For the stadimeter, have a look at stoianm's video tutorials, he used it quite often (probably in Chapter 9. How to use manual TDC)

http://www.subsim.com/radioroom/showthread.php?t=181538

It's a sticky thread on top of this forum

a) For vertical use (taking the altitude of a celestial body, distance measurement)
- The sextant must be perfectly centered on the screen (the default position of the sextant).
- The sextant scale(60°) must perfectly cover the whole screen (bottom to top).
- The 0°-scale must be perfectly match with the sea horizon; difficult when the u-boot is rolling in the sea (100% realism).

Position error when measurering celestial bodies: +- 120 sm ( = +- 1° error) or more
Position error and other use: acceptable

b) For horizontal use (running-fix, 2-position-fix, measure the angle between any two landmarks)
http://navyadministration.tpub.com/1...4220_238_9.jpg
- The sextant must be perfectly centered on the screen (the default position of the sextant).
- Best to begin measurement from the center-point of the screen.

Position error: acceptable

Unless I'm mistaking, a common occurance, then;

.....is in error.

There are 60 sm (see miles are the German version of nautical miles and the same as nautical miles) to one degree, thus, 120 sm equals two degrees , not one degree.