Jonathan_S wrote:HH02 implies that it lies in a grav wave - since Fearless and her convoy are still under Warshawski sail when they start their descent into the Grayson (well, the Yeltsin system where Grayson is) from the Delta bands [HH2:Ch5] - and Fearless doesn't reconfigure back to impeller wedge until after they've entered normal space (just outside the F6's hyper limit)
HH02:Ch11 also mentioned two ships arriving "radiating the blue glory of hyper transit from their Warshawski sails"
Since you don't use sails outside of a grav wave (or wormhole terminus) the ships wouldn't have been under sail until the Yeltsin system sat in a grav wave.
OTOH HH02:Ch22 implies that even without a sail Troubadore could make it from Yeltsin back to Manticore - but she'd have to do so under impellers and wouldn't be able to rise above the Gamma bands. So maybe the 'wave Honor rode to Yeltsin just barely brushed the system, so Troubadour could have gone far enough in normal space to avoid it when entering hyper. Or maybe it doesn't extend below the Delta bands, so Alpha, Beta, and Gamma can be traversed near Yeltsin without working sails.
(That later wouldn't entirely explain why ships arrive at Yeltsin with their sails deployed -- but maybe continuous descent, starting from within the 'wave, explains that)
(And I just checked HH03 where the freighter makes it to Yeltsin before being killed, and I don't see anything about grav waves or sails. The point of view is entirely from the GNS Jason Alvarez, patrolling within the Yeltsin system -- and she just sees the impeller sources as the freighter and it's pursuers appear in normal space.
The companion, House of Steel, doesn't seem to mention Grav Waves at all; much less which system(s) exist within them. However if you want it electronically it is available - Amazon will sell you a Kindle copy, or you can buy it directly from Baen's website (https://www.baen.com/house-of-steel.html) and then download it in various formats (epub, mobi, pdf, rtf, etc.)
In HoS chapter 2 , it mentions that the wave they are traveling in is a very narrow one, ("barely a half light-month deep and a light-month wide") meaning a warship traveling at 60% light in normal space could travel past the Grav wave in less than 2 weeks, and even less if Yeltsin is at the edges of the wave.