UNDER CONSTRUCTION RULE 20.1 Hailing
Let’s look at what the rule says:
20.1 Hailing
A boat may hail for room to tack and avoid a boat on the same tack by hailing ‘Room to tack’. However, she shall not hail unless
(a) she is approaching an obstruction and will soon need to make a substantial course change to avoid it safely, and
(b) she is sailing close-hauled or above.
In addition, she shall not hail if the obstruction is a mark and a boat that is fetching it would be required to change course as a result of the hail.

In the example above, we can see that Blue is close-hauled and moving towards an obstruction. To avoid it, Blue must make a substantial course change. There is no mark in play so Blue may hail for room under Rule 20.1.
So to sum up Rule 20.1
- Conditions for Hailing
- A boat may hail “Room to tack” if:
- She is close-hauled or higher (i.e., sailing upwind).
- She needs to tack to avoid an obstruction.
So to sum up Rule 20.1
- Conditions for Hailing
- A boat may hail “Room to tack” if:
- She is close-hauled or higher (i.e., sailing upwind).
- She needs to tack to avoid an obstruction
- Timing of the Hail
- The hail must be made in time for the other boat to respond without unnecessary risk.
- Obligation to Respond