They have been spotted and I am listening for them. I have two elements pointed their way, and I am just starting to hear them near San Francisco. I’m a little surprised that they are using this call, so I suggest that you scan the clusters for /MM no matter what.
If you need that grid and others along the way – good luck!
vk0ek.org 
I wanted everyone to know that I just heard from my husband, Adam K2ARB. he says he is sleeping and reading. so they are all okay.
Thank you Gigi – appreciate it very much.
I worked them when they were en route to Heard Island under the call sign ZL/ZS9HI/MM. Operator was Vadim UT6UD, if I wrote down correctly. Wonder how to get this Q confirmed.
Pierre, F3WT
Please see QRZ.com