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stehsegler said..
From a helicopter it might make a small difference. When you are drifting in the water and rescue comes from a boat it makes little or no difference. A colourful sail is not a safety device!
There is a reason why long distance windsurf, SUP, kite races require you to carry an emergency flare. A helicopter search and rescue crew can spot a flare as far away as 4 kms depending on sea conditions regardless of what the ambient light does. For them to spot your sail drifting in the ocean the have to be within a few hundred meters of range.
As for a place like Mauritius. I assume the friend is talking about being caught out at the reef with wind suddenly dying. If none on the beach knows you are out there my advice would be ditch the rig, tie the board to yourself and start paddling.
I sailed on ships for 10 years. In most cases it is not easy to spot a sailing yacht. Yes in force 1-2 wind with no swell and nice sunny weather you spot them from 3-4 miles away but in force 5 with some waves it becomes much less. Besides most officers will look at their screens more often nowadays (radar / electronic charts / freaking iphone) so chances go down even more. Extra lookouts only at nights.
Without light in the night you have zero chances.
So no chance for you standing on your board and waving.
If the coastguard comes to search specifically for you then yes you have more chances.
To be safe I agree to take a flare, and would like to add another device.You can get a Personal locator beacons (PLBs).
www.yachtingworld.com/features/epirbs-plbs-and-man-overboard-aids-62213These are the best. Mandatory for work on deck in offshore for all crew. They are small and you when you activate them they send a signal to a rescue center with your position included in the signal. Signal is send via satellites.
They will also appear on rader/ais/digital charts of passing merchant ship. They are very clear and will be picked up 100%.