[Xastir] Receiving messages

[Phil]

I'm currently in an area with an APRS repeater and so I've been 
motivated to have a play with Xastir again.

During the past few days I've tracked some mobile stations with a call 
sign that is known to me. Using Xastir, I've sent these stations a 
message but I've never received a reply. The probable reason for no 
response it that the station is unaware that I've sent them a message 
which brings me to my question; how will I know if a station does respond?

Also, my station shows up in the "all stations" list but not in the 
"mobile stations" list. Under "Configure Defaults" I've selected "Mobile 
Station w/local time".

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Regards,
Phil