Three boats are racing. Two overlapped boats close hauled on port tack, green and blue, converge with yellow, a boat close hauled on starboard tack. Green’s sail number is 17, blue’s is 58 and yellow’s is 43.

At position 1, Blue hails “Room to tack seventeen”. At position 2, Yellow hails “You tack”. Green makes no hail.

Issues:

As between blue and yellow which has right of way initially?

See Rule 10

As between green and yellow which has right of way initially?

See Rule 10

What are blue’s options for avoiding yellow?

See Rule 19.2 and Rule 20 and definition of obstruction

Is blue entitled to hail? Does blue’s hail impose an obligation on green? See Rule 20. Note in Radio Sailing Appendix E 1.3(b) “Hails under rules 20.1 and 20.3 shall include the words ‘room’ and ‘tack’ and the sail number of the hailing boat, in any order.”