This screen is presented when you press the Update Keplerian elements button from Setup/Satellites or Setup/Groups. It defines the actions Nova for Windows that will take when updating Keplerian elements. You will be prompted for a file name that should contain new Keplerian elements.
If the new database contains data for satellites that are not already in your NfW database, the new satellites are added automatically.
If the new database contains data for satellites that are not already in your NfW database, the new satellites are NOT added automatically. No satellites are removed from, or added to, your existing NfW database.
The Clean button acts the Update button except that any satellites in your existing database that are absent from the new database will be removed. In other words, after a Clean operation, there should be a one-to-one relationship between the main NfW Database and the satellites in the new Keplerian Element file.
The FTP button opens another window where you can configure and begin downloading of new Keplerian elements via the Internet. This function uses "FTP" protocol. You must have an internet connection for this function to operate.
Timed Update function automatically reads a specified text file at a regular interval and attempts to update Nova for Windows’ Keplerian element database. This function is useful if you have new Keplerian elements delivered automatically and if they are copied into the same file name each time.
Ignore checksums means that Keplerian elements will be accepted even if the checksum digit is incorrect. Checksums are used to indicate errors in data sets, so use this option with caution.
Checking Preserve satellite names will tell Nova for Windows to keep any existing satellite names even if the new Keplerian element file contains different names. For example, if you like the name "Oscar 10" but the new Keplerian element file calls it "AO-10," then checking this box will let the name remain as "Oscar 10."