GPS Facts
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| How many GPS satellites are there? | Minimum of 24 plus some spares. Currently there are 28 operational satellites. The number varies - see http://tycho.usno.navy.mil/gpscurr.html for up-to-date status.
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| What is the orbital distance of the satellites? | 20,200 km (10,900 miles)
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| How many satellites are required to allow 3 dimensional positioning? | At least 4. The system is designed so that there are always at least 4 satellites visible at every location on earth.
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| What are the 3 dimensions for a position? | Latitude, Longitude, and Altitude.
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| How long does each satellite take to complete one orbit? | 12 hours
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| When was the first GPS satellite launched? | 1978
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
wths-scioly
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