OK, so we missed this one first time around. Head back to Broker and get this one out of the way. It's an odd jump, as it only seems to head directly into a wall. We feel sorry for the guy we crushed here. Honest.
OK, now you'll need to have cleared enough missions to open up the next island - Alonquin. It should only take you about 5 hours or so, depending how fast you play. It's not an exact science, especially if you stop for some warm coffee with Michelle.
There are several jumps hidden around the north of Alonquin. Some of them are very tricky, as most require alot of speed to get right. Again, check the video to see the optimum run-up.
Jump 17, in particular, requires a lot of speed for it to register as good enough. Exactly what the criterion is for success is anyone's guess.