Collect points are shifted Arcpad Trimble GeoXH 2008

[ChristopherSwank]

I'm very new to GIS.   I am trying to collect some points on our Trimble.  After using Arcpad to collect them, when I import them into ArcMap, they are off about 15' to the west.  To further test the alignment of the points, because so many things can be configured in ArcMap, I upload the points to ArcGIS online instead to see if they show on their ortho correctly.  If they do, I assume I can import them into my mxd and they will show correctly.  When I import them to ArcGIS Online, they are off, just as they are in ArcMap.  I have to conclude that soemthing is off on the Trimble because the other shape files I have show up correctly within ArcMap and on ArcGIS online.  With the shape file created on the Trimble, they are off.  

Within ArcPad I'm using WGS_1984.   I throught WGS_1984 was the standard and they would show up on ArcGIS online correctly? 

Can anyone help me?  I used GPS Pathfinder to post process one set of points I collected but it only shifted them slightly, not enough to put them in the correct spot.

Thank you,
Chris

[BrettBlack1]

You are on the right track here. What correction source are you using in the GeoXH? If you are using SBAS for sub-meter accuracy then you should not use the ArcPad GPS Datum default of WGS_1984, instead you need to use one of the ITRF datums, due to the SBAS corrections. If you are utilizing a VRS/RTN, then you need to find out what the network is sending for corrections and match up the GPS Datum accordingly.

I hope this helps.