I have a tabular data set that contains eastings and northings and LAT and LONG data. I check some points manually with the ArcGIS "go to xy" point tool and they al appear to be in the correct place on a base map. However, after numerous attempts at bringing the data into arc and using "display xy data" to place them on the map I still end up with the data being projected in the wrong place and to the wrong scale.
What could be causing this, and how do I fix it?

I am operating with ArcGIS, Displaying in Decimal Degrees, WGS 1984 WM (Data frame coord system)

Projected Coordinate System: Name: WGS_1984_World_Mercator

Geographic Coordinate System: Name: GCS_WGS_1984

closed as unclear what you're asking by PolyGeo Aug 17 '17 at 9:59

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    Hard to know without more info. Please edit to include a sample of your coordinates and some detail as to how they're in the wrong place/wrong scale when you enter them (a screenshot or two may be useful). Outline your "display XY data" process. – Midavalo Feb 13 '17 at 17:31
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    Are the checked points in the same place as their matching processed points? – Midavalo Feb 13 '17 at 17:32
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    if there in decimal degrees bring them in with WGS84/4326 then project the layer to your projected coordinate system – ziggy Feb 13 '17 at 17:40
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    Just to verify that you are importing correctly..x,y is actually long, lat. That throws a lot of people when they are getting started with GIS & coordinate systems. If you are inverting them, you will get results that are way off. (lat = y, long = x) – MaryBeth Feb 13 '17 at 17:42
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    Reiterating @ziggy comment. The Add XY tool defaults the coordinate system to the data frame's. If the xy data is lat/lon, you have to change it from the default. – mkennedy Feb 13 '17 at 20:02