GPS for Life is for those want to know what it is to be a disciple of Christ. As such, it offers a place for new believers to grow in the Word as a disciple. Not only for new Christians, it is also for Christians who desires to renew their relationship with God and rededicate their lives.GPS for Life Workbook is an adjunct to the titled book, GPS for Life, which has the worksheets. However, the workbook has only worksheets and does require the accompanying book, so should be purchased as a two-volume set.