getting really bad position using real nav

[belzebubek]

Hi,

I'm getteing really bad posiotions - see picture. Note that first position is OK.

https://e-lista.pl/sh5/really_BAD_position.png

Using real nav and mod list:

Generic Mod Enabler - v2.6.0.157
[C:\Ubisoft\Silent Hunter 5\MODS]

Magnum_Opus_v0_0_1
Anti-Lag
nVidia missing lights
Original map colors
Remove Steelvikings shadow mod
DBSM_Music_1_0_4
IRAI_0_0_30_ByTheDarkWraith
Manos Scopes-patch for 8x5
Critical hits 1.1 Torpedos
Critical hits v 1.2
MightyFine Less Annoying Footsteps 1.0
NewUIs_TDC_6_7_0_ByTheDarkWraith
NewUIs_TDC_6_7_0_Real_Navigation
Trevally Automated Scripts v0.6
Trevally Harbour & Kiel Canal Pilot v2.8
Equipment_Upgrades_Fix_1_2_byTheBeast
stoianm upgrade available mod comp Equipment_Upgrades_Fix_1_2_byTheBeast
EngineSoundsImproved_v1.0
Grossdeutscher Rundfunk
EQuaTool 01.01 by AvM - Large Style
EQuaTool 01.01 by AvM - add-on - Coloured Simple Tools

please help me to fix this issue. thanx!

[TheDarkWraith]

First fix will always be accurate

You must be using dead-reckoning fixes (yep, just saw it in the messagebox)

If by bad fixes you mean showing fixes on land then there's nothing I can currently do about it. The game doesn't give me a way of determing whether a location is water or land.

You can change the error % of dead-reckoning fixes by adjusting the user options file:

# the max error (expressed as %) a dead-reckoning fix occurs based on distance between fixes (used in real navigation only). This value is fed into a random function as a -min value and max value:
NavDeadReckoningMaxCalcFixError = 15

[belzebubek]

Thank you for reply.

I'm new to sh5 and also to real navigatiion. If You could please explain me a bit - does posted picture mean that something is really wrong with game or not - I mean further situations for example while tracking enemy ship my own positiun should be very accurate for all math calculations and so on.

next example picture is below.

https://e-lista.pl/sh5/slightly_BAD_position.png

[TheDarkWraith]

everything looks fine :up:

Just having a ship in sight does not guarantee a perfect dead-reckoning fix. I don't even check for that. When you ask for a dead-reckoning fix there will always be error (defined in options file). If you want near precise fixes then you need to be asking for celestial fixes.

[belzebubek]

thanks!

[mia389]

Don't tell anyone but I changed my percentage to 5% awhile ago :oops:

[Sailor Steve]

This guy seems to know what he's talking about.

Accuracy

Sextants measure the angle between the sea horizon and a celestial body. These angles are measured in degrees and minutes of arc (1/60th of a degee). Measuring this angle to an accuracy of 1 minute of arc (1') will result in a positional accuracy of 1 nautical mile. Accurate sextants can measure this angle to an accuracy of 0.2'. This means that theoretically one can determine their position to 1/5 of a mile. Additionally, a good clock is required to accurately compute the GP of the celestial body. An error of 1 second in the clock will create a positional error of up to 1/4 of a mile.
http://www.cse.yorku.ca/~amana/personal/navigation/

One-fifth of a mile is 1056 feet, or 322 metres. The Kiel Canal is 162 metres wide at the widest point and 102.5 metres at the narrowest. This means that the Canal is half as wide as the margin-of-error for celestial navigation. which means your marks look about right for real life.
http://www.kiel-canal.org/english.htm

In waterways and harbors navigation is done by eyeball, not celestial or dead-reckoning. This is why a waypoint system is still a good idea for those conditions. It beats navigating the Canal in real time manning the helm yourself, which is how it's really done.

[belzebubek]

Well, I'm still a bit confused.

- all engines stop;
- speed zero;
- actual visual position is between two islands;
- celestial postion shows N2! (picture below)
- dead reckon is N3
- next dead reckon after movin using visual is N4, in real it was a bit more away than mouse cursor on picture below.

does it mean about 4 km inaccuracy using real nav ?

https://e-lista.pl/sh5/still_inacurate_position.png