D13 — Maintenance card and capability limits

All six maintenance bookings are authorised commitments. Their one-day durations and £500 extra costs are known assumptions at the start. They consume both vessel and the named qualified pair's time. No maintenance outcome beyond completing the modelled booking has been promised.

Kestrel carries the published island links and permitted dry freight; only Edda is a published Kestrel skipper. Morrow is the field and bulk freight boat; only Niall skips it. Tern handles repairs and light freight; only Suri skips it. Bo and Fen can work deck on any vessel; Tam can work deck on Kestrel or Morrow. Suri, Bo and Fen have repair capability; Niall, Tam and Fen have field capability.

No spare vessel, relief skipper, hired contractor, volunteer pool, cross-training qualification or loan facility exists in the released case. An agent may propose one, but cannot schedule it or claim its consent until specific evidence is released. Unused capacity does not imply permission to change someone's personal role.

The capacities are intentionally an intelligible resource model, not a model of seamanship or safety. Failure to model real conditions is a limitation of the experiment and cannot be repaired by making up nautical facts.