Re: Navigation
Posted by:
Parade
()
Date: November 14, 2001 09:24PM
<HTML>Hi Bill,
Submarines used knot-meters, like pitot tubes, as surface ships. But the difficulties are the estimate currents. (force and direction) So, every time she surfaced, the navigator observed with astronomic instruments and calculated the new nautical position. Sometimes, the different was important (about 10 to 15 nautical miles after 24 hours submerged).
Now, there are a lot of knot-meters, inertial systems which are a very good accuracy. Less than 1 nm per week.
Regards</HTML>
Submarines used knot-meters, like pitot tubes, as surface ships. But the difficulties are the estimate currents. (force and direction) So, every time she surfaced, the navigator observed with astronomic instruments and calculated the new nautical position. Sometimes, the different was important (about 10 to 15 nautical miles after 24 hours submerged).
Now, there are a lot of knot-meters, inertial systems which are a very good accuracy. Less than 1 nm per week.
Regards</HTML>
| Subject | Written By | Posted |
|---|---|---|
Navigation
|
Bill Watt | 11/14/2001 04:13PM |
|
Re: Navigation
|
Bram | 11/14/2001 05:01PM |
|
Re: Navigation
|
Antonio Veiga | 11/14/2001 08:59PM |
|
Re: Navigation
|
Parade | 11/14/2001 09:24PM |
|
Re: Navigation
|
Theo Horsten | 11/17/2001 12:47PM |
|
Re: Navigation
|
Theo Horsten | 11/17/2001 01:13PM |
|
Re: Navigation
|
jim king | 11/17/2001 10:39PM |