NavCom Sapphire Rev.J - Manual (Page 48)

Sapphire Technical Reference Manual Rev. J
48
1.2 2DNAVMODE (ASCII)
SF-3050 Sapphire SF-3040
This command is used to enable or disable GPS navigation with height constrained (2D
navigation) and set the height constraint when the receiver computes a 2D navigation solution.
Command: [2DNAVMODE] mode, height
Parameter Definition
mode 2D navigation mode, keyword (NEVER, ALWAYS, AUTO) defined in Table 13.
height
Value used to constrain the height relative to mean sea level (float, meters) (-100 m. to
30980 m.). This argument is optional; if no height is entered, the GNSS receiver uses its
previous height for the 2D solution. The height value out of valid range (-100 m to 30980m)
is rejected as an invalid argument.
mode Default: NEVER
height Default: 0.0 meters
Table 13: 2D Navigation Mode Settings
Keyword Mnemonic 2D Mode of Operation
NEVER Never generate a 2D solution. Always generate a 3D solution or no solution at all.
ALWAYS
Always generate a 2D solution, with the height fixed at the valued entered via the
height parameter. If this keyword is entered, the height parameter must be entered
by the user or the command will be rejected.
AUTO
Generate a 3D solution whenever possible. Otherwise, automatically try to
generate a 2D solution, with the height fixed at the entered height value, or at the
previous height value if no height is entered.

Upper height limit imposed due to export limitations
Use 2D navigation mode only when the height can be constrained accurately.
Otherwise, large errors may occur in the position solution.
Examples: [2DNAVMODE] AUTO
Command the receiver to automatically switch between 2D and 3D modes as
needed.
[2DNAVMODE] ALWAYS, 10.5
Command the receiver to switch to 2D mode and set 2D height to 10.5 meters.
[2DNAVMODE] ALWAYS
Command the receiver to switch to 2D mode and use its previous height constraint
for 2D solution.