Yachties Right of way

Is the area around the submarine barrier covered by the 10kt speed limit? - I can't recall offhand what still constitutes the Portsmouth Harbour limits
 
If I'm not mistaken* coming from chichester you require a turn to port coming through the submarine barrier in order to alter course to south of boyne. So unless I'm misunderstanding this (which I confess I may be) the risk of collision was created by the OP's manoeuvre 2 mins (at 19kts) before reaching the buoyed channel (2.5 minutes before potential collision).

Rather than turning into the path of a vessel and expecting it to notice you and and get out of the way within 2 mins might it not have been more prudent to make the initial turn a few degrees more to aim behind the other vessel in the first place?

*Arguably if the OP cut across north of bar beacon at high tide and was only skimming just south of boyne I can see how you could just make a straight line out of this. I forget that not everyone has a keel to speak of...
 
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If I'm planing (which will be 25knots +) I treat yachts as if they're stationary & drive around them. It doesn't matter if they are motoring & I'm stand on. It's easy for me, so I'll make a change in course. I'll usually go behind them so that they don't have to crash through my wake (although there isn't much to it at speed) & I generally turn 90 degrees to run parallel (but opposite direction) to their path for a while so that my intentions are clear. Then I make another 90 degree turn to cross behind them and a long curving turn to get back on my original track. Sharp turns in a planing boat are fun - It's a good excuse to chuck the boat about and a win-win as far as I can see. (If it's crowded/can't see/don't know what's hidden by the yacht I'll slow down or take a wider detour.)

If I'm at displacement speed & the yacht is sailing; I'll give way/stop/wait. If they're trying to sail on/off a mooring or down the river on a quiet day; then KUDOS to them & I'll give them an extra wide berth.

If I'm at displacement speed and the yacht is motoring; I'll try to apply the colregs as appropriate. As far as I recall I've only once had a yacht come close to hitting me in this circumstance when I was stand on vessel. He looked straight at me but just carried on. I stood on until it was obvious we would collide, when I stopped and gave some blasts on my horn. I thought he was just being a dick but the huge look of surprise on his face and the sincere wave of apology, showed that he really just hadn't seen me.

I used to get angry about this stuff but I'm a lot more mellow these days.
 
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