2. OPERATION
2-10
2.8 THD Display Mode
THD (Transmitting Heading Device) display mode outputs heading data to external
equipment. This display mode has three sub display screens. The default screen is
the HDG (heading) data screen. The sub screens, in displayed order, are: ROT (Rate
Of Turn) screen o HDG/ROT split screen o THD integrity screen.
Press the ENT key to cycle through the display screens.
2.8.1 HDG data screen
The HDG data screen shows your current heading and any offset applied to the head-
ing data.
How to interpret the THD data display screen
Indication Description
FIX Current position fixing method (GP-3D, GP-D3D, etc.)
PDOP Current DOP (Dilution Of Precision). Displayed as PDOP for positional
dilution, HDOP for horizontal dilution.
CALC Calculation status.
• [NORMAL]: HDG and ROT are calculated normally.
• [DR]: HDG and ROT are calculated using Dead Reckoning.
• [STOPPED]: HDG calculation stopped.
• [SYS FAULT]: System fault.
COM. SV Commonly used satellite’s number.
1
104.
NORMAL
GP-D3D 9.6 31
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