NavCom Sapphire Rev.J - Manual (Page 135)

Sapphire Technical Reference Manual Rev. J
135
1.90 L1FALLBACK (ASCII)
SF-3050 Sapphire SF-3040
This command is used to enable/disable the L1 fallback (or optimized shading) option. When L1
fallback is ON, dGPS mode precedence is set to Dual 3D  Single 3D  Dual 2D  Single 2D.
Command: [L1FALLBACK] on_off
Parameter Definition
on_off Keyword (ON, OFF)
Default: OFF (the recommended setting)

The L1FALLBACK feature is designed for challenging operating environments,
such as briefly running along a tree line, and may benefit general navigation in this
scenario.