Something I don't recall anyone else mentioning: if you get the timing right it's also possible to temporarily goose the throttle, ride out the SLOW DOWN warning and still make the safe exit from supercruise. I save a couple of seconds or so on every approach doing this.
The key seems to be making sure that you're doing less than 1000km/s when you pass the 1000km threshold. In the example above I'm quite a way under, but I've had success doing this right on the 1000km/s limit. It's more of an art than a science and I'm sure it's possible to cut things finer, but I've found the "throttle up at 30Mm, throttle down at 4-5s" rule gives the most consistent results. I've never had an overshoot when staying within those limits. It works even better at signal sources where there's no planetary mass to get in the way.
It's also great for escaping mass shadows when you've misjudged the approach between a planet and its station. As long as the station is less than 30Mm away, just keep the throttle at maximum while you align on the station. Ignore the speed, and just throttle back when the ETA is about to hit 4 seconds. It's a little trickier because the speed can ramp up suddenly as the planet "lets go" of your ship, but it saves riding the 6-7 second window for an eternity and the worst you'll suffer is an occasional overshoot.
[video=youtube;gqLhGpCwK_U]https://www.youtube.com/watch?v=gqLhGpCwK_U[/video]
The key seems to be making sure that you're doing less than 1000km/s when you pass the 1000km threshold. In the example above I'm quite a way under, but I've had success doing this right on the 1000km/s limit. It's more of an art than a science and I'm sure it's possible to cut things finer, but I've found the "throttle up at 30Mm, throttle down at 4-5s" rule gives the most consistent results. I've never had an overshoot when staying within those limits. It works even better at signal sources where there's no planetary mass to get in the way.
It's also great for escaping mass shadows when you've misjudged the approach between a planet and its station. As long as the station is less than 30Mm away, just keep the throttle at maximum while you align on the station. Ignore the speed, and just throttle back when the ETA is about to hit 4 seconds. It's a little trickier because the speed can ramp up suddenly as the planet "lets go" of your ship, but it saves riding the 6-7 second window for an eternity and the worst you'll suffer is an occasional overshoot.