Operation Manual

Robertson AP300X Autopilot
40 22081814H
If you select the LOCAL TIME menu item and then press ENTER, the
following display will appear provided a sentence containing the UTC
message is available at the NMEA input(s):
06
ESC MAIN
ENTER
UTC TIME
LOCAL TIME
24
07 40
Use – or + to set your local time and press ENTER.
Position calibration
Note ! Entry of position calibration is optional and is not required unless your
position source requires correction.
The AP300DLX has the capability to add correction to
Latitude/Longitude data received from each position source. The
correction for each position source is entered individually and the
corrections are stored when the unit is switched off. The correction can
be made by adjusting the position to a known position, or by position
offset specified in nautical charts.
If a position source input is corrected this will be indicated with a #
when the position source is indicated.
Paper-charts very often use a different datum than the WGS84
commonly used by GPS navigators. Some of the GPS' receivers have
the possibility to convert WGS84 position to the local datum used in
your chart. In case you use a "black box" GPS without this possibility,
the corrections must be done by AP300DLX.
Example:
GPS position N 58°27.00', E 005°58.30' [ WGS 84 datum]
The chart is in European Datum ED50 with correction specified
(relative to WGS84):
Latitude: N 0.03 Longitude: E 0.09
Added to the WGS84 it gives the ED50 position: N 58°27.03', E
005°58.39'
This will be the corrected position read on AP300DLX.