Before your swim, we'll ask for evidence of a trial swim in comparable conditions to your proposed route, completed without aids or pacers, with your coach or team leader present, and in some cases also observed by your SSO swim master. The aim of this trial is to show us that you can cover a substantial portion the intended distance at a reasonable pace, in similar waters, without undue fatigue, and using your intended feeding plan. Aim to get this trial swim done no later than a few weeks before your proposed swim (but earlier is better). A successful trial swim is ultimately a matter of our judgement, but in general we're looking for the swimmer to cover 16km in well under 7 hours.