If it's all within view and you retrieve your dingy and return the "borrowed" to it's state as prior to the "borrowing" it's OK, you are not stealing - your dingy is drifting away and it's a situation where time is of the essence.
A few years ago I was sitting in my cockpit
about 5/8ths of the way through a bottle of red and waiting for the moon to make a romantic entrance over the rocks and pine trees of a nearby island when a ghostly apparition drifted into my consciousness over the starboard bow, it was someones rubber duck going for a jaunt by itself obviously having been freed of the beach by the rising 5 metre tide.
I was of two minds as to whether I should rescue
it as I was well into the wine bottle, it was well into the night, because of the big tides the currents are fairly swift in the area and it was a pretty remote
location. Anyhow, good samaritan instincts prevailed over good sense and I rescued it and tied it up behind my boat
for the night. The next morning another yacht came dashing by obviously in search of a lost
dingy, spotted the miscreant and the owner came to fetch it. There was no profuse thank yous for the rescue
and the careless owner left me with the feeling that he thought I was attempting to steal his dingy.
There's a number of points which follow from this little narative:
Should I try harder to suppress these samaritan instincts and thereby avoid the
possibility of hurt feelings resulting from dudgeonly beneficiarys.
Since I was going to be accused of stealing the dingy, should I have deflated it and
stowed it out of sight as legitimate salvage
By having done the good samaritan act, am I entitled to use someone else's dingy
without their permission to retrieve my own.