@Wingchundub,

For mountain bike use I would use OSMAND+ it is much better for off road use.

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I use it in conjunction with my GPSMAP 66S and eTrex.
See that GPX file from Garmin work with OSMAND+

If I were you I would give it a try.......

Hope this helps you.

One thing if you do try OSMAND+ please move to that forum area for talks..........