Thanks, all.
Lunch is coming. They have cameras too.
He (or she) was, according to our driver's range finder, about 200m away; and we were in a Zodiac, about 50m offshore. I don't think there was any danger.
Reminds me of the joke about a couple of ramblers, who were half-way across a field when they spotted a bull. The farmer was leaning on a nearby fence.
"Excuse me: is this bull safe?"
"Oh, he's safe, sure. Safe as houses."
<reflective pause>
"Can't say the same about you, though."
Jeremy