figure shows the relationship between the different height models and illustrates the reason why the two hardly ever match spatially.

low-tech method of measuring altitude / elevation/ vertical angles in a pinch

Using the “Radial Search” retrieval method, look for the closest “Any Vertical Control” in the Data Type Desired drop down list.

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GPS Receiver Information, Software, and Hardware Reviews of Garmin, Lowrance, Magellan and other GPS Receivers

GEOID03 is a refined model of the geoid in the conterminous United States (CONUS), which supersedes the previous models GEOID90, GEOID93, GEOID96, and GEOID99.