Altair Glide Computer and Navigation System User Manual download pdf (Page 50)

4 CROSS COUNTRY TASKS

In the OLC analysis page, the aircraft track is shown as a thin green line, and after optimisation,

the optimal path is shown as a thick red dashed line.

If continued ﬂight in ﬁnal glide will result in higher score, the displayed results are shown as ‘In

progress’ and a blue line shows the projected path to improve the score. For Sprint and Classic

OLC types, this path is extended in the direction to the current waypoint. For Triangle OLC type,

this path is extended in the direction to produce the largest triangle.

The score and computed optimal distance is approximate.

If continued ﬂight in ﬁnal glide will not achieve a higher score, or if the aircraft has landed, the

displayed results are shown as ‘Finished’.

Depending on the duration of the ﬂight, the time required to calculate the optimum path may take

up to 10 seconds.

4.8 Logger

A ﬂight logger conforming to the IGC ﬁle speciﬁcation can be used to record ﬂights.

Several ﬂight loggers are accessible via XCSoar:

• A software-based logger. All versions of XCSoar have this functionality. The logger con-

forms to the IGC standard but is not certiﬁed.

• The PRO version of Altair has an internal IGC certiﬁed logger device. XCSoar communi-

cates with the logger as if it were an external serial device.

• XCSoar can also send declarations to some external logger devices, such as the EW log-

ger. For this to work, the device name must be speciﬁed in the “Devices” section of the

conﬁguration settings.

When the internal software logger is active, a small diamond in the lower right corner of the map

area ﬂashes once per second.

By default, XCSoar is set up to automatically start and stop the internal software ﬂight logger when it

detects the aircraft is ﬂying and when it has landed, respectively. Only when the logger is manually

started it does ask if the ﬂight is to be declared; when automatically starting it automatically declares

the current task.

If a task has been declared, then subsequent attempts at modifying the task result in a warning

message asking to conﬁrm whether the action is to be taken and invalidate the declaration. This is

intended to make it harder to accidentally modify the task resulting in a failed declared task.

The XCSoar software logger, when started, checks for 500kB of free space on the ﬁle storage.

If there is insufﬁcient space, it will automatically delete IGC ﬁles, oldest ﬁrst, in order to free up

500kB. It does not ask the user for conﬁrmation before performing this operation.

The internal software logger buffers data so that when it starts (automatically or manually) up to 60

seconds of data prior to starting is recorded. This means that the software logger now adequately

captures the full takeoff.

Conﬁguration

The connected Logger can be conﬁgured through the following menu:

43 XCSoar Manual (Altair version) • XCSoar-A-EN

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Altair Glide Computer and Navigation System User Manual Page 50