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Download the latest MX421 (4.902) release here [August 24, 2009]
Download the WayPtIO application here
Download the latest MX521 (6.705) release here
Download MX420 (V x.x870) release here
NOTE: MX420 (Version x.x849B and later) software contains new features, and is necessary for operation with MX535 AIS transponder and/or MX575 D/GPS Sensor and Compass.
CAUTION:
Before you upgrade the unit with new software, make sure you save your
configuration settings (including waypoints and routes).
Please make sure to cold-start the unit after upgrading the software!
NOTE: New usernames and passwords have been issued. Please notify a representative for more info.