  The puzzle of ultra-high energy cosmic rays (UHECRs) still remains
unresolved. With the progress in preparation of next generation experiments
(AUGER, EUSO, OWL) grows also the importance of directional analysis of
existing and future events. The Galactic magnetic field (GMF) plays the key
role in source identification even in this energy range. We first analyze
current status of our experimental and theoretical knowledge about GMF and
introduce complex up-to-date model of GMF. Then we present two examples of
simple applications of influence of GMF on UHECR propagation. Both examples are
based on Lorentz equation solution. The first one is basic directional analysis
of the incident directions of UHECRs and the second one is a simulation of a
change of chemical composition of CRs in the energy range 10^13 - 10^19 eV. The
results of these simple analyses are surprisingly rich - e.g. the rates of
particle escape from the Galaxy or the amplifications of particle flux in
specific directions.
