Continue CPR until help arrives. Once circulation and breathing are restored, warm the victim up to stave off hypothermia. Sharing body heat in a sleeping bag is one of the best ways. If you have been ice fishing or duck hunting and carry hand warmers, place them under the victim's armpits and against the groin. My brother recommends that anyone who has been submersed for a minute or more be checked by a doctor.
Some people can become short of breath hours after nearly drowning.
This is called secondary drowning or postimmersion syndrome and is potentially dangerous. You owe it to your fellow sportsmen to become certified in the basic procedures of cardiopulmonary resuscitation. Contact your local hospital or Red Cross to sign up for a course. Hands-on instruction is the only way to become fully proficient in the techniques.