Much response to this topic! Certainly of interest to me. As others have already responded: Maybe even just as much so when our first mates are with us,
we are solo sailors.
A couple of months ago, I posted about my severely medically compromised spouse being upset because I was beginning to scale back her being on the boat out of my concern for her safety. One gust induced heel, or wake from a passing motor vessel, or a wave that most people would easily adjust to, and she instead might end up in the hospital with broken arms, legs, or hips, or multiples thereof.
Most respondents to my post suggested that I was being too conservative. That it was her choice. (Comment: A valid point and we are still sailing occasionally only on calmer days and only with the jib out. However: Although she logical knows the risks, she is stubbornly in denial. In real life, even as acknowledged by her MD's, if we had an incident, she could very likely be consigned to a convalescent home for several months in physical and emotional pain and from which she might never recover. And less importantly than the outcome on her, is the stress on me wanting to keep her company for many hours each day at a convalescent home and then worried about the miserable time she is having there every night alone. And later, attending to her recovery for several more months after she comes home after the convalescence. I/she have already been there before so we have a good idea the scenario.)
Anyway, back to the more generic question by the OP. With the exception of only a few passengers of mine that have previously owned boats, I have always felt much more confident and safe sailing solo than with others on board. Any "first mate" that isn't comfortable/competent with all aspects of sailboat operation should recognize this.
Sailing a boat is combination of acquired skill, a bit natural aptitude, interest, and reasonably frequent practice. Some people pick it up quickly. Others never. And certainly few "occasional" guests can take over in the case of an emergency. No way can a short safety overview/instruction at the berth suffice. Would sort of be like an airline that before each flight has a policy to call up several passengers from the cabin to instruct them on how to fly, navigate and land the 757 if the captain and co-pilot happen to both have a medical emergency.
The recount of people needing assistance to operate the TV/DVD remote was great!
Here's my similar analogy below. From "Procedure to Program Toyota Wireless FOB Remote Transmitters". (After several attempts I did mange to accomplish!) For a newbie on a sailboat, multiply the confusion of this instruction times 100 for jib control, main sheet control, dousing the sails, starting and using the engine, steering control, forward/reverse, using the VHF, points of sail, rules of the road, communicating with the Coast Guard GPS coordinates, disengaging the auto-pilot, uncertainties of wind velocity and direction and sea condition; and so on.
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Procedure To Program Toyota Wireless Remote Transmitters:
Begin with: The driver's door open and unlocked. Key out of the ignition.
1. Insert and remove the key from the ignition switch 2 times within 5 seconds.
NOTE: Steps 2 and 3 should be performed within 40 seconds.
2. Close and open driver's door TWICE.
3. Insert the key into the ignition and remove it.
NOTE: Steps 4 - 6 should be performed within 40 seconds.
4. Close and open the driver's door twice.
5. Insert the key into the ignition.
6. Close the door.
NOTE: Steps 5 and 6 should be reversed for the following models ONLY (close door first, then insert key into ignition):
2000 - 2005 Celica
2001 - 2003 Prius
2001 - 2005 ECHO
2001 - 2005 RAV4
2003 - 2004 Avalon
7. Turn the ignition switch from "Lock" to "On" and back to "Lock" at about 1 second intervals to select the desired mode:
1 time for ADD mode.
2 times for REWRITE mode.
3 times for CONFIRMATION mode.
5 times for PROHIBITION mode.
8. Remove the key from the ignition.
9. To confirm your mode selection, the power locks will now cycle "lock" to "unlock" a number of times corresponding to your key cycles in step 7.
NOTE: If Confirmation or Prohibition modes have been selected, opening the door will complete the procedure.
10. For Add or Rewrite modes do the following within 40 seconds of Door
Procedure Lock confirmation:
A. Press both car transmitter Lock and Unlock buttons simultaneously between 1 and 1.5 seconds and release.
B. Within 3 seconds of step A, press the transmitter Lock button for more than 1 second and release.
If the keyless entry remote transmitter has been successfully programmed, the power locks will cycle "lock" to "unlock" once at this time.
If there are problems with the remote transmitter or the procedure up to this point, the locks will cycle twice. If this occurs, verify that you have received the correct transmitter, and then repeat the above procedure.
C. If multiple remotes are to be reprogrammed, repeat steps A and B.
11. Open the driver's door to conclude programming mode.