@j9k .... hehehe, I thought I'd just whispered it .... and yes, sound really does travel well on the water! PLUS - I was in REALLY shallow water & they would have run aground if they'd come much closer!! I tried to 'point them away' towards deeper water, but they just wave back! LOL
Sadly, most boaties don't give a stuff for non powered craft when, by law, they are supposed to 1) SLOW DOWN and 2) STAY 50M AWAY - but they don't! ... hence, F*** Off is my favourite catch cry out there! LOL