ShinyShoe, thank you for bringing that to my attention. I did not take into account the forces at play, and the fact that it would be a possible hazard in that configuration, as you say, I have not yet taken my boat out
Luckily, a newbie like myself, even meaning well, can be advised by good people who are much more experienced, and can also avoid someone else taking my suggestion, which seemed like a good idea at the time, and becoming unstuck
In this case, would the sensor of one of those fish-finders, mounted at the base of the transom, offer a reasonable report of depth and obstacles (fish or hopefully other things) up to the bow of a small boat as mine, and would it be oriented to face downwards (I can't grasp whether the sensor is like a small disc, and needs to be flat on the bottom of the boat to work downwards... or whether flat against the bottom of the transom would allow it to send waves across to the depths like the edge of a round drinks coaster, so to speak). Kind regards.