Thanks for all the helpful responses to my previous query. I have another newbie question. How does altitude effect the timing and position of predictions? I view from various parts of NC,GA & TN and without a topo for each site I have trouble figuring altitude. My GPS seems useless for altitude measurements even when locked to several sats with strong signals. So far guessing at the altitude hasn't caused me to miss anything but I want to remove as many of the local variables as possible so I can refine future predictions of the dimmer and more difficult objects. Thanks Gary zeno@tds.net ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html