<para>The logger's memory is organized in sectors, serially numbered starting at 0. Each sector takes 4096 bytes of data.
Typical devices hold about 250 sectors. The memory is always filled from sector 0 on, until it is full or the device being
erased again by the user.</para>

<para>Normally you can safely omit this option. However, it might be useful to read data from erased devices: we observed
that on erase, only the first two sectors are actually cleared. The following example shows how to read the remaining data:
</para>

<example id="skytraq-restore-erased">
  <title>Command showing how to read data from an erased device</title>
  <para><userinput>gpsbabel -i skytraq,first-sector=2 -f /dev/ttyUSB0 -o gpx -F out.gpx</userinput></para>
</example>
