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Chapter 8 - Understanding Waypoint/Route Navigation
958 Operator’s Manual, Rev. A
2. To display the coordinates you want to enter (as lat/lon, distance and bearing, or loran TDs), press the COORD
TYPE menu key to cycle through the choices:
• lat/lon for any location worldwide
• distance and bearing from “here” (your present position), or from any waypoint stored in the 958
• loran TDs (make sure the GRI displayed is correct, and change it if necessary)
3. Use the KEYPAD to enter the waypoint’s coordinates.
If you like, you can now give the -QUIK waypoint a unique name after you’ve entered its coordinates, since the next QUIK waypoint you make will overwrite this one: Just move the cursor to the NAME field and change the name from -QUIKto a unique permanent name before continuing.
4. Press the ENTER key twice. The 958 begins guiding you directly to the waypoint.
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Chapter 8 - Understanding Waypoint/Route Navigation
Navigating to previously stored waypoints
This lets you select a stored waypoint from a list of waypoints, and then go to the waypoint:
1. Press the WAYPTS/ROUTES key, then press the WAY-
POINTS menu key. You may have to press the NEXT VIEW menu key to display the most convenient list (often the
LOCAL list, since the waypoints you navigate to are usually nearby).
2. Press the CURSOR PAD to select the waypoint you want to navigate to.
3. Press the GO TO menu key, then press the ENTER key.
The 958 begins guiding you directly to the waypoint.
Steering to a waypoint
To display information that helps guide you directly to your destination waypoint, press the STEER key. If you press the
STEER key twice, you’ll display two versions of the steering screen: Use whichever one you like.
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Chapter 8 - Understanding Waypoint/Route Navigation
Choosing a steering screen
Both screens help guide you precisely along a course line, which might follow a harbor channel or a line between shoals and sandbars. Both screens graphically show your cross-track distance, which is the distance you are from your course line.
Both screens show numeric navigation information at the top.
NOTE:
You can also use the CHART screen to steer by when you want to get to a waypoint and don’t need to stay precisely on the designated course line.
Displaying distance and bearing
Both screens show your distance and bearing to the waypoint, and your Speed-Over-Ground (SOG) and Course-Over-Ground
(COG). Your 958 may show an arrow between the SOG and
COG displays, pointing upwards when the trend of your speed is increasing, and down when it’s decreasing.
When you’re less than a mile away from a destination waypoint, you can show the distance to the waypoint in feet by setting the 958’s steering distance precision option to HIGH.
For details, see ”Changing the steering precision” starting on page 171.
958 Operator’s Manual, Rev. A Page 113
Chapter 8 - Understanding Waypoint/Route Navigation
Understanding the cross-track display
On the steering screen
The STEERING screen uses a traditional display that shows cross-track distance as how far your vessel symbol is from the center line of the display (your course line). When your vessel symbol points towards the course line, you’re moving closer to the line; when it’s parallel to the course line, you’re keeping a constant distance from the line; and when it points away from the course line, you’re moving further from the line.
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The two short vertical lines near the sides of the screen show the limits of your cross-track distance. This same distance is also displayed in numbers near these vertical lines. If you go over this cross-track distance limit, the 958 issues an alarm and your vessel symbol will flash. To display this alarm message, press the STAR key. To clear the alarm, press the
CLEAR ALARM menu key. To adjust the cross-track limit, see
”Choosing the cross-track scale” starting on page 171.
Note: The direction your vessel symbol is pointing tells you the direction you’re actually travelling. The direction may not be the same as your heading, if any current or wind is present, or if you’re moving at a very low speed.
NOTE:
If you’re following a route and the 958 sequences to a new leg, your vessel symbol will show your COG relative to the new leg and should be straight ahead once you’ve finished turning the vessel.
958 Operator’s Manual, Rev. A
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