Respawnships.sbc

<?xml version="1.0"?>
<Definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <RespawnShips>
    <Ship>
      <Id>
        <TypeId>RespawnShipDefinition</TypeId>
        <SubtypeId>RespawnShip</SubtypeId>
      </Id>
      <DisplayName>OFSV II</DisplayName>
      <Icon>Textures\GUI\Icons\Fake.dds</Icon>
      <CooldownSeconds>900</CooldownSeconds>
      <Prefab>RespawnShip</Prefab> // this line is your ship file name
    </Ship>
  </RespawnShips> 
</Definitions>

steamapps\common\SpaceEngineers\Content\Data\Prefabs\RespawnShip.sbc