Abstract: Systems, methods, and apparatuses are provided for compensating for ionospheric delay in multi constellation Global Navigation Satellite Systems (GNSSs). In one method, a single Radio Frequency (RF) path receiver receives a first signal at a first frequency from a first satellite in a first GNSS constellation, receives a second signal at a second frequency from a second satellite in a second GNSS constellation, and calculates the ionospheric delay using the received first signal and the received second signal.

Abstract: Systems, methods, and apparatuses are provided for compensating for ionospheric delay in multi constellation Global Navigation Satellite Systems (GNSSs). In one method, a single Radio Frequency (RF) path receiver receives a first signal at a first frequency from a first satellite in a first GNSS constellation, receives a second signal at a second frequency from a second satellite in a second GNSS constellation, and calculates the ionospheric delay using the received first signal and the received second signal.

Abstract: A process for providing a year-round tax monitor whereby baseline tax data and current year-to-date tax data for a user is obtained. Data representing current tax year directives made by the user, and/or data representing tax related choices made by the user in the current tax year to date, and/or data representing tax related events associated with the user in the current tax year to date is also obtained. Using the baseline tax data, and/or current year-to-date tax data, and/or the data representing current tax year directives made by the user, and/or the data representing tax related choices made by the user in the current tax year, and/or the data representing tax related events associated with the user for the current tax year, an estimate and/or projection of tax liability for the current tax year is calculated and a projected tax refund that will be owed to, or a tax liability that will owed by, the user for the current tax year is estimated.