Simrad HS52, Instruction Manual

Page: 44 / 80

Simrad HS52 GPS compass and DGPS navigator
36
20222360 / E
Nmea Decimals
The number of decimals used in the NMEA GGA/GLL position
solution can be selected in the range 3 to 6. The value is 6,
which gives the highest position resolution. The default value is
5.
Expert Setup
The Expert setup submenu includes the selections; heading
offset, alarm sound, position and heading alarm, GPS cold
restart, run mode and logging of data.
The instructions for the different selections are as follows:
Head Offset
The Head offset feature allows you to correct for a constant
compass heading offset that may be present as a result of an off
axis misalignment between the Sensor unit and the vessel
alongship axis.
Note! It is important that the Sensor unit is mounted accurately in the
alongship direction so the
Head offset value does not exceed
±5°. If the mounting orientation is not within these tolerances
the heading accuracy will be degraded. Instead of exceeding a
Head offset value of ±5° the Sensor unit orientation should be
adjusted mechanically.
The system has to be calibrated on board the vessel after
installation. A typical calibration consists of calibrating the
direction of GPS antennas within the Sensor unit against an
external reference. Type of reference must be decided according
to the required accuracy. Alternative references for calibrating
the heading offset of the Sensor unit could be:
•
The heading of the pier or quay the vessel is moored to.