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Minefields - Examples

Starmap —> Minefields —> Minefields - Examples

This page contains the following examples:


This example shows where a starship can be relative to a minefield, with respect to mine hits and web drain.

For the purposes of this example, a minefield is considered in isolation. Possible changes to the size of a minefield due to the actions of other players is not considered here, but often need to be in a game.

The minefield used in this example contains 4284 mines, has a pre-decay radius of 65 light-years and a post-decay radius of 63 light-years. This size of minefield is used as an example, as smaller minefields often don't show these effects clearly.

Location        Inside Minefield?        Distance Reference        Distance
A No Pre-Decay Circle >= 5
B No Pre-Decay Circle >= 1 AND < 5
C No Pre-Decay Circle > 0 AND < 1
D Note 1 Post-Decay Circle > 0 AND < 1
E Yes Pre-Decay Circle On or Inside
F Yes Post-Decay Circle On or Inside

Action        A        B        C        D        E        F
Mine Sweep - Normal Mines No Yes Yes Yes Yes Yes
Mine Sweep - Web Mines No No Yes Yes Yes Yes
Mine Scoop No No Yes Yes Yes Yes
Mine Impact No No No Note 2 Yes Yes
Web Drain No No Note 3 Yes Note 3 Yes
Movement Could Hit Mines No No No Note 2 Yes Yes
New Mines Expand Minefield No No No Notes 2 , 4 Note 4 Note 4


  1. If the post-decay circle is hidden, the square is outside the minefield. If the post-decay circle is visible, the square is inside the minefield.
  2. These actions are defined with respect to the pre-decay circle, not the post-decay circle.
  3. Web Drain is defined with respect to the post-decay circle, not the pre-decay circle.
  4. This depends on whether or not the ship is inside the minefield with the closest center. For more information, please see the following example.

Laying Mines

This is an example of what can happen when laying a minefield. Specifically, it covers information on when a new minefield will be created. It is the intention of this example to clarify the following information from the "Creation & Expansion of Minefields" section of the Minefields documentation.

To determine whether a new minefield is created or an existing minefield is expanded, the Host first needs to find the closest minefield center, where the minefield both is of the same type (normal or web) and has the same owner as the mines being created. If two qualifying minefields have centers precisely the same distance from the minelayer, the minefield with the lowest ID is used. If the vessel laying mines is currently within that minefield, it is expanded. Otherwise a new minefield is created.


There's a large minefield and a small minefield. There is also a starship in the large minefield, but just outside of the small minefield. The starship has the Lay Mines mission selected, with a Friendly Code of MD1.

Using the above description, we first find the distance to the centers of the relevant minefields. The center of the large minefield is 56.6 light-years from the starship, while the center of the small minefield is 38.4 light-years away. The center of the small minefield is closer, but the starship isn't in it. Based on the above description, we expect that a new minefield will be created.


The next turn, it can be seen that a new minefield has been created, as expected.

The order in which the initial two minefields were created isn't relevant to this example, but could be of interest to some readers. The large minefield was initially created with 10 torpedoes, then the small minefield with 10 torpedoes. Finally, the large minefield was expanded with 20 additional torpedoes.