APPENDIX 3 CALIBRATION
AP-8
Where; d: distance run (NM), Vg1, Vg2: GPS measured speed (kn), Vd1, Vd2: doppler
speed log measured speed (kn).
By conducting the same test using different speed conditions, you can obtain varied sam-
pling data. Use the average values to calculate a calibration value and allow a 2% margin
of error.
Note 1: For how to enter the speed calculation, see SPEED CAL menu (main menu→
[SYSTEM]→[SPEED CAL]) in the operator’s manual.
Note 2: To measure the average trial speed, use the speed trial function (see
section 3.5.5).
b) The ship's fore/aft (Y-axis) speed is calculated based on the time traveled.
This method uses the fore/aft (Y-axis) speed as the GPS milepost. The calculation is made
by the VBW speed (taken immediately after switching to water-based speed).
c) Calculation is based on a one-mile course, traveled three times.
Calculation is done with the same method as a).
d) Calculation is based on the time traveled over a predetermined time.
Calculation is done with the same method as a).
2) How to use survey poles as a milepost
Calculation is done using b) from method 1).
A
d
Vd1
B
Vd2
Doppler
Speed Log
speed
Margin of error䠄䠂䠅䠙
Vg1
Vg2
DGPS
speed
Vg
mean
=
Vg1 + Vg2
2
Vd
mean
=
Vd1 + Vd2
2
Vd
mean
- Vg
mean
Vg
mean
× 100
(go)
(return)
(return)
(go)
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