Considering the longitudinal extent of India, *29* longitudes with a difference of 1° can be drawn on the map.Jul 12, 2018
How many degrees are there in a circle? It is the same everywhere, it is 360. However your question is not relevant. The lines on the map are rough guides. The navigator finds a location then uses dividers or a ruler to locate the exact latitude and longitude. Of course, GPS rapidly does this, but good, life saving practice is to record it, physically on a chart, every time it is fixed.
If you go on a ship you may get access to the bridge. I always look at the chart on the table to see actual practice. Because of speed, many ships nowadays just draw the course desired electronically. They read the compass and enter that into the autopilot and that's it. In my boat before departure, I always drew my desired course on the chart. Then using my estimated speed, say 5.5 knots, I looked up the estimated tide and direction at hourly intervals and calculated offset. I then added the corrections up for my trip and steered the calculated course.
Every hour, I take a fix on my position to check on my intended and actual. When I started, I had to use RDF using the radio bearings from lighthouses and buoys. Occasionally I could get a visual bearing on a buoy or lighthouse. These were good. Each fix needed to be on three points and they never centred, you get a triangle and use the centre as your fix. The navigator then recalculates his course and applies corrections.
Answers & Comments
Answer:
29
Explanation:
Because if we consider 29 longitudes by 1° we can draw 29 longitudes
Answer:
Considering the longitudinal extent of India, *29* longitudes with a difference of 1° can be drawn on the map.Jul 12, 2018
How many degrees are there in a circle? It is the same everywhere, it is 360. However your question is not relevant. The lines on the map are rough guides. The navigator finds a location then uses dividers or a ruler to locate the exact latitude and longitude. Of course, GPS rapidly does this, but good, life saving practice is to record it, physically on a chart, every time it is fixed.
If you go on a ship you may get access to the bridge. I always look at the chart on the table to see actual practice. Because of speed, many ships nowadays just draw the course desired electronically. They read the compass and enter that into the autopilot and that's it. In my boat before departure, I always drew my desired course on the chart. Then using my estimated speed, say 5.5 knots, I looked up the estimated tide and direction at hourly intervals and calculated offset. I then added the corrections up for my trip and steered the calculated course.
Every hour, I take a fix on my position to check on my intended and actual. When I started, I had to use RDF using the radio bearings from lighthouses and buoys. Occasionally I could get a visual bearing on a buoy or lighthouse. These were good. Each fix needed to be on three points and they never centred, you get a triangle and use the centre as your fix. The navigator then recalculates his course and applies corrections.
Explanation:
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