Bedienungsanleitung Furuno GP150 (Seite 49 von 97) (Englisch)

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8-1

8. MENU

SETTINGS

8.1 GPS Menu

Menu description

Fix mode

Two position fixing modes are available: 2D

and 2/3D. The 2D mode provides two

dimensional position fixes (latitude and

longitude only) and is used when three

satellites are in line of sight of the GPS

receiver.

The 2/3D mode switches between two and

three dimension position fixing automatically

depending on how many satellites (three or

four) are in light of sight of the GPS receiver.

ANT Height

Enter the height of the antenna unit above

sea surface (000-999 ft, 000-304 m). The

default setting is 16 ft.

Disable satellite

Every GPS satellite is broadcasting

abnormal satellite number(s) in the Almanac.

Using this information, the GPS receiver

automatically eliminates any malfunctioning

satellite from the GPS satellite schedule.

However, the Almanac sometimes may not

contain this information. You can disable an

inoperative satellite manually on the GPS

SETUP menu.

GPS smoothing, position

When the DOP or receiving condition is

unfavorable, the GPS fix may change greatly,

even if the vessel is dead in water. This

change can be reduced by smoothing the

raw GPS fixes. A setting between 0 and 9 is

available. The higher the setting the more

smoothed the raw data, however too high a

setting slows response time to change in

latitude and longitude. This is especially

noticeable at high ship’s speeds. "0" is the

normal setting; increase the setting if the

GPS fix changes greatly.

GPS smoothing, speed

During position fixing, ship’s velocity (speed

and course) is directly measured by

receiving GPS satellite signals. The raw

velocity data may change randomly

depending on receiving conditions and other

factors. You can reduce this random

variation by increasing the smoothing. Like

with latitude and longitude smoothing, the

higher the speed and course smoothing the

more smoothed the raw data. If the setting is

too high, however, the response to speed

and course change slows. For no smoothing,

enter "0." "5" is suitable for most conditions.

Speed average

Calculation of ETA and TTG, etc. is based on

average ship’s speed over a given period.

The default setting is one minute.

RAIM function/RAIM accuracy

RAIM (Receiver Autonomous Integrity

Monitoring) is a diagnostic function which

tests the accuracy of the GPS signal. To use

the RAIM function, enter the range (from

own ship in meters) for which you want to

know position confidence, on the GPS Setup

2/2 menu. The receiver estimates position

confidence using range value and detected

satellite error, and displays (provided the

RAIM function is active) the results as one of

three levels of position confidence, at the top

right-hand corner of the screen. The three

levels are as follows:

SAFE: GPS signal is normal. The positioning

accuracy satisfies the setting value.

CAUTION: RAIM accuracy cannot be

calculated. (Signals from more than five GPS

satellites are necessary.) The positioning

accuracy does not satisfy the setting value.

UNSAFE: GPS signal is abnormal, therefore

the positioning accuracy is not reliable. Note

that the GP-150 does not exclude abnormal

signals automatically.

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