NavCom Sapphire Rev.J - Manual (Page 127)

Sapphire Technical Reference Manual Rev. J
127
1.73 GEOIDALMODEL (ASCII)
SF-3050 Sapphire SF-3040
This command is used to select a geoidal database or to query the currently selected geoidal
database.
Command: [GEOIDALMODEL] {NONE, GGM02, GEOIDAL99, DEFAULT}
Parameter Definition
NONE Deselect geoidal database
GGM02 Select GGM02 geoidal database
GEOIDAL99 Select GEOIDAL99 (user-defined) database
DEFAULT Select geoidal database according to the default priority list
Default: DEFAULT

Only two types of Geoidal models may be loaded in the SF-3050: GGM02 and
GEOIDAL99. The GGM02 geoidal database is factory loaded. The user may define a
GEOIDAL99 database and load it into the receiver. The GEOIDAL99 model is typically
more precise than the GGM02 model. If loaded, it is typically preferred.
When the DEFAULT keyword is used, the receiver automatically selects the
Geoidal model according to this default priority list: GEOIDAL99, GGM02, NONE.
The model listed first, GEOIDAL99 is used if it is loaded in the receiver; otherwise,
the next model, GGM02, is used if it is loaded. If neither Geoidal model is loaded,
NONE is selected. The sequential order of the priority list cannot be changed by the
user. The GEOIDAL99 model is listed first because it typically provides the highest
precision.
If the user does not desire the automatic selection of the loaded Geoidal model(s),
based on his geographic position, he can input a specific model. This supersedes
the DEFAULT keyword, which then must be input when automatic selection is
desired.
Examples: [GEOIDALMODEL] DEFAULT
Selects geoidal database according to the default priority list
[GEOIDALMODEL] NONE
Deselects geoidal database
[GEOIDALMODEL] GEOIDAL99
Selects geoidal99 (user-defined) database
[GEOIDALMODEL] GGM02
Selects GGM02 geoidal database
[GEOIDALMODEL]
Returns the currently selected geoidal database