Example:
GPS Latitude = N 40 23.30’ W069 22.10’
Chart Latitude = N 40
00.15’
00.04’
To make a manual position correction of S 00.15’
Press the
key. The numeric values to the right of the L/L box
change to cursor lines to accept the new values. Enter Lat offset difference
into GPS. Use
direction if GPS L/L reads
direction if GPS
reads higher value. Press 0
,
1,
00.15’
S o u t h e r l y .
Measure difference in Longitude. If the GPS Longitude is less,use
W
direction;
if
the
GPS Longitude is greater, use the E direction.
Press O,O,O, 4
00.04’ Long. offset (Easterly).
352.1.7 Response = L/L =
SPD
Unlike a compass or speed paddlewheel, the
100 GPS sensor does
not calculate L/L position, Course, or Speed changes instantaneously.
Instead, these readings are calculated from changes to your position over a
short period of time. The
accuracy
of these functions, however, is excellent
(within one degree and 0.1 knot under ideal conditions). One major
advantage you can enjoy with these readouts is that the resultant data of
course and speed are actual measurements over the ground which include
the effects of wind and tide.
For the Position, Course, and Speed readouts, there are three display
responses or
available for selection. They are:
SHORT
Very responsive, slightly erratic (3 seconds)
Good response; more stable
(10 seconds
Slower response, very stable
(30 seconds )
To change response time from SHORT to
or LONG, press the
RESPONSE
=
=
until the desired averaging period is high-
lighted on the screen.
to return to the
STATUS display.
OPERATION 105
