Raytheon STD 21 GPS Operation Manual page 78

Heading Correction:
By adjusting the vertical difference between the mounting position of the Antenna Unit
and the ship's centerline, the heading is corrected.
The mechanical mounting angle must not exceed ±6°.
Differences which are below ±6° must be measured (sign--corresponding) and entered
into the Processor Unit.
Referring sources of this difference can be:
-- Heading of the pier versus STD 21 GPS heading value.
-- Heading values from other heading sensors versus STD 21 GPS heading value
(Attention: Tolerances may be added).
Figure 60: Sign--corresponding input of mounting angle (heading)
3717/110--850.DOC020002
Satellite Compass
STD 21 GPS
The measured angles should be noted in case of a re-
placement of the Processor Unit.
max. +6° max. --6°
Antenna Unit
70
Mast
Edition: Feb. 05, 2007