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Pocket GPS World :: View topic - Mapsource TOPO vs USGS Quad
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Mapsource TOPO vs USGS Quad

 
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ematrejek
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Joined: 26/07/2003 15:00:45
Posts: 1
Location: United States

PostPosted: Sun Sep 14, 2003 8:04 am    Post subject: Mapsource TOPO vs USGS Quad Reply with quote

My problem is I am plotting a cross country route through the Sierra's using both USGS 24K quads and

Mapsource TOPO West don't match. Waypoint coordinates plotted on the Quad using a UTM Waypointer ruler and

waypoints created in TOPO don't coincide. A point on the quad doesn't match the same spot on the Mapsoure TOPO.

For example on the Mt. Hilgard Calif. quad the center of Lake Italy lies at 3400000 E 41360000, but in TOPO the

same spot on Lake Italy is 340150 E 4136250. Mapsource. The difference averages about 150 m east by 200 north.

What's causing the difference and how do I correct for this? I can plot successfully between of different scales.
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