Try the Sky & Telescope Mars Profiler:
http://skyandtelescope.com/observing...cle_929_3.asp#

"Maurice Gavin" wrote in message
...
Is there an on-line Mars map that shows a view of the planetary disk
computed for any day/ time? I'd like to identify the features seen at
2AM this morning.

A Google search found
http://pauli.math.sci.hokudai.ac.jp/~hatake/marsnow/
which is excellent but shows Surveyor type topographical features
which I find unhelpful rather than the albedo features we actually
see.
Apologies if this request previously answered and TIA.