How reliable are ‘blind’ warp jumps? So ships can traverse the warp without a navigator because the engines still function alone, but it’s only feasible over very short distances that can be plotted by normal humans. 

But are these short blind skips any safer than a navigated translation? Since there is no navigator and his big warp eye to attract entities to the ship? Could it be preferable in any circumstance to jump blind rather than use the navigator?