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Sask | Trimble's planning software let's you adjust for an obstructed sky.
Get it here: http://www.trimble.com/planningsoftware_ts.asp?Nav=Collection-8425
Download the latest almanac and move it to the Planning folder. Update it at least once a month.
ftp://ftp.trimble.com/pub/eph/almanac.alm
Setup is under File > Station. After you're set up, do a quick run by going back to the main screen. Check the GPS box and then Graphs > DOP > DOP - Horizontal. An EZ-Steer needs an HDOP under 3 to stay engaged, don't know about your system. This is for an unobstructed horizon. To set it up for obstacles, goto File > Station > Obstacles. Put your mouse pointer inside the bullseye and drag it across so you gray out the area between the pointer and the outside ring. You can backfill and it doesn't work if you start with the mouse pointer outside the bullseye. Click OK, check your HDOP and see if you're good to go or not. Selecting both GPS and Glonass sats usually show a major improvement.
Edited by QuAppelle 3/4/2012 15:11
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OK...experienced my first satillite loss.................
