How To Select The Raim Function - Furuno GP-170 Operator's Manual

9. OTHER FUNCTIONS
4. Select [2 Not Used GPS].
5. Enter the satellite numbers with the numeric
keys.
6. Move the cursor to [Enter] then press the NU/
CU ENT key.
7. Press the MENU/ESC key to close the main
menu.
Core filter
1. Press the MENU/ESC key to open the main menu.
2. Select [8 System Setting] then [5 GNSS].
3. Select [3 Condition].
4. Select [5 Core Filter].
5. Select [1 No] or [2 Yes].
[No]: The tracking sensitivity is better than [Yes], however the ship's
track is traced less smoothly than [Yes].
[Yes]: The ship's track is traced smoother than [No], however the tracking sensi-
tivity is not as good as [No].
6. Press the MENU/ESC key to close the main menu.
9.3.4

How to select the RAIM function

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. The receiver esti-
mates 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 con-
fidence, at the top right-hand corner of the display. 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 val-
ue.
• Unsafe: GPS signal is abnormal, therefore the positioning accuracy is not reliable.
1. Press the MENU/ESC key to open the main menu.
2. Select [8 System Setting] then [5 GNSS].
3. Select [4 RAIM].
4. Select [1 Setting].
5. Select [1 On] or [2 Off].
[On]: Use RAIM function. Go to step 6.
[Off]: Don't use RAIM function. Go to step 9.
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