On Thu, 15 Dec 2005 22:18:14 -0800, "BTIZ"
wrote:


3) GPS receivers need WAAS to get good accuracy in the Z-axis. They are much
more accurate in the other two axi.

Garmin 396 does have WAAS capability. On my Garmin 295 this was a
feature that had to be turned on via menu. WAAS mode = on, is
something the OP should check.