After considering all the forgoing suggestions for an ALTERNATE NAVIGATION
system for XCSoar, I believe there is a relatively simple solution that fits
within the current XCSoar architecture and requires little user input to
execute.
  
How the Next info box is handled is the key to making the change from
navigating the task to navigating to an alternate. The following concept
relies on assigning the NEXT info box exclusively to task navigation and
assigning  ALTERNATE  info boxes exclusively to navigating to a specified
waypoint. Activation of either the NEXT info box or an ALTERNATE info box
will determine current navigation status, i.e.  TASK and ALTERNATE  info
boxes must be assigned an active status which will determine which
navigation mode is executed.

TASK NAVIGATION (series of waypoints to be navigated in sequence)
* Activating the NEXT info box means you are on a TASK.
* NEXT info box is only used to display next task waypoint, never an
alternate.
* TASK needs to be loaded for TASK navigation to be activated.
* The default when TASK is loaded is:  TASK navigation is active.
* To activate  TASK navigation either load a task or if loaded and not
active, click/tap NEXT info box.

ALTERNATE NAVIGATION (GoTo a specified waypoint)
* ALTERNATE  info boxes initialize empty and maybe set to empty when a task
is loaded. Initializing empty
  or load last value could be set as a user option
* To activate  ALTERNATE navigation: click/tap ALTERNATE info box. 
* To select an  ALTERNATE use current XCSoar methods, e.g. select from
waypoint list and select GoTo, click waypoint on map and select GoTo, etc.
Selecting a waypoint in this manner will automatically activate  ALTERNATE 
NAVIGATION and load waypoint data into  the ACTIVE ALTERNATE info box. NOT
into NEXT info box which is current behaviour .
* Activating an ALTERNATE  info box means you are navigating to an interim
waypoint before proceeding   on task to the next waypoint.
* Arrival at the  ALTERNATE could make an automatic switch to task mode and
set navigation to the Next waypoint in the task. May need a user option to
control this behaviour.
*To abort the  ALTERNATE before arrival and proceed on task click the  NEXT
info box.
* When no task is loaded last three actions do not apply navigation focus
remains on the  ALTERNATE waypoint.

The following screen shots illustrate the concept.

<http://xcsoar.1045713.n5.nabble.com/file/n5710422/TASKactive.jpg> 
<http://xcsoar.1045713.n5.nabble.com/file/n5710422/ALTERNATEactive.jpg> 



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