ⓐ Ship stability : The ability of the ship to return to the upright when slightly inclined. ⓑ Transfer : This is the distance travelled in the direction of the original course by midship point of a ship from the position at which the rudder order is given to the position at which the heading has changed 90 degree from the original course. ⓒ Walk back : To reverse the action of a windlass to lower the anchor until it is clear of the hawse pipe and ready for dropping. ⓓ REQUEST : This indicates that the following message if the reply to previous question. ⓔ WARNING : This indicates that the following message implies the intention of the sender to inform others about danger.
