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Here's a good question, one that is actually a source of disagreement...
On both of these questions, you're under tower supervision on an ILS approach.
You have the airport in sight, ten miles out and tower clears you for the visual. You lose visual with the airport and subsequentially go missed.
Do you follow the published miss, or do you (in lieu of obstructions) climb straight ahead and ask tower for further instructions?
Personally, I brief "...in lieu of instructions from tower on the missed, I'll fly [the published miss]"
But largely, if you do the published miss at a busy airport, tower is going to lose their minds as far as I've heard.
Discuss discuss!
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If I were on the ILS, and subsequently proceed visual, then go popeye again, I'm with you, in lieu of instructions from tower, I'll proceed inbound to the MAP and fly the published remaining (obviously) above LOC MDA. That's where the published missed is valid, not before that point. Granted, at a busy radar tower field, you'd probably be getting vectors/instructions fairly quickly.