The navigation function coordinates the match and inquiry functions to position the inquiry portion of the split screen format as close as possible to the point of match failure on a non-matched address. Navigation does not change the display on a matched address; it is geared to react to the matcher's non-space return codes to drill down into the database as far as possible.
For example, a house range mismatch generally will result in the inquiry half of the screen being positioned at the house range on the street entered on the top half of the screen. If the street is misspelled, however, the position will be at the same street name entered on the match portion of the screen. The purpose of this process is to get as close as possible to a correct address without having to drill through apparently correct levels of the database.
The Navigate (Nav) toggle command turns navigation on or off. Navigation is only available in split screen processing (since a non-matched address is required to activate the function) and can be used in concert with the UR (batch not coded) function. For more information on the commands available in interactive processing, refer to Command Field.