Markus Armbruster
4ea4a01fd5
(all): Depend on info. Flatten info directory. This undoes the move to one subdirectory per chapter, which was done during Empire 2. The structure doesn't buy us much, as the info name space is flat, and it complicates makefiles. Overhaul info.pl: - It now wants to run in the root of the build tree. - Information on source files and subjects is now stored in makefiles, thus info.pl no longer picks up random junk from the file system. - Clean up Perl anachronisms, in particular use subroutine arguments and results rather than global variables where convenient. - Change format of diagnostics to the common format used by GNU tools, so that Emacs and the like can parse it. - Catch missing .SA. - When creating a new subject file, cowardly refuse to overwrite an existing file. - Subject files contain topics sorted by chapter, then by name. The order of chapters used to depend on how Perl sorts hash keys. Fix it.
96 lines
3.6 KiB
Perl
96 lines
3.6 KiB
Perl
.TH Command SONAR
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.NA sonar "Use sonar to look for ships"
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.LV Basic
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.SY "sonar <SHIP/FLEET> <brief?>"
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The sonar command allows ships to look for submarines
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and submarines to look for ships.
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.s1
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If the <brief?> argument is
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specified then the sonar map will not be drawn. This is useful if you
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just need to see the list of ships you can detect. Whether or not a
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map is printed, the sonar information will be added to your bmap.
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.s1
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Only ships at sea may use sonar and sonar only detects ships
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which are at sea. Furthermore, there must be a straight line of water
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between the detector and the detected (sonar doesn't work around corners).
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.s1
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In the current implementation, sonar works similar to
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lookout. The major difference is that a submarines cannot use
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lookout to sight ships. Likewise, submarines cannot be sighted
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by ships via lookout.
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.s1
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There are two aspects to sonar - passive and active sonar.
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.s1
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ACTIVE SONAR
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.s1
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This is the most visible form of sonar. It is simply a
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ship's ability to use sonar pings to detect other ships.
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The range of a ship's active sonar is identical to the
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range that it can sight ships via lookout.
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(see \*Qinfo lookout\*U)
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When you type "sonar 25", you are using active sonar.
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.s1
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PASSIVE SONAR
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.s1
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This is more subtle. Passive sonar is a ship's ability
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to hear sounds, mainly active sonar pings. When a ship
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pings you with active sonar, you can detect that ping.
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If a ship with sonar gets pinged, that country receives
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a telegram saying "Sonar ping from x,y detected by ship Z!"
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In its current implementation, passive sonar is the ability
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to detect a ping.
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.s1
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When a ship emits a ping, that ping has to travel out to a
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target ship, reflect off of it, and then return to its source.
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So, in order to detect a ship X sectors away, a sonar ping
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must be able to travel 2X sectors - from the source to the
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target, and back to the source. So, if a ship can use active
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sonar to detect ships X sectors away, passive sonar can detect
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active sonars from 2X sectors away. So the range at which you
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can detect sonar pings is twice the range at which you can use
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sonar.
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.s1
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The active and passive sonar modes means that you want to be
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careful when you use sonar, because you will tell others where
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you are long before you actually detect them. This also gives
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you some warning before you get your submarine attacked, as
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enemy ships have to use sonar to find you. The key to submarine
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warfare is "run silent", meaning use your sonar only when you
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have to.
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.s1
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On the other hand, destroyers are designed to hunt subs. A
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destroyer guarding a player's coast should use sonar often,
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especially if it has other destroyers nearby to support him if
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he gets in trouble.
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.s1
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For example:
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.EX sonar 3
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.NF
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sb2 submarine 2 (#3) at 24,0 efficiency 76%, max range 2
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Sonar detects TheBorg (#5) bb4 battleship 4 (#1) @ 23,-1
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.
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. B ?
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\&. . 0 ?
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. . .
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. . .
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.FI
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.s1
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Sonar-capable ships of tech 310 or better can also detect mines with
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their sonar, although at only half their normal sonar range. Mines
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will show up on the sonar map as 'X' and this 'X' will be added to
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your bmap.
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.s1
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In the case of using sonar to detect subs, detection = (sub visibility + ship
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spy value). If detection is less than 8, then the sonar will just
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print you something like:
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.NF
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Sonar detects sub #12
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.FI
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If detection is above 7, then you will be told the ship type, and if
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it is above 9, you will also be told the owner of the sub. Note that
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type and owner will always be shown for Friendly subs.
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.s1
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Planes with the ASW ability can use
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sonar while on recon missions. See info recon for more details.
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.s1
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.SA "coastwatch, Ship-types, Sector-types, radar, recon, Ships, Detection"
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