We just get around using the odometer in the recce car (transport stages)
Most don't use any Terratrip in recce cars, and it's not needed unless you're planning on writing your own notes, and even then it's marginal.
I typically like to mark kilometre distances on the side of the notes, mainly so the nav can tell the finish officials where/if they saw a car off, cross referencing with the officials info.
It's also good if the nav makes a note on the notes just to confirm they're on the right spot, any obvious landmarks like a big fence, or yellow sign, or dead tree, that kind of thing. The nav doesn't call it to the driver, it's simply confirmation that you are where you think you are..... and if you have a few of those landmarks throughout your pace notes, it really makes it much quicker and easier to get back on the notes if you happen to fall off.
Hope that helps
Hope you enjoy yourselves too!