--- AnyEvent-GPSD/GPSD.pm	2008/07/02 05:17:37	1.2
+++ AnyEvent-GPSD/GPSD.pm	2008/07/02 05:21:58	1.3
@@ -90,9 +90,11 @@
 minimum value for a good fix).
 
 C<fix> contains either C<1> to indicate that this satellite was used for
-the last position fix, C<0> otherwise.  EGNOS/WAAS etc. satellites will
+the last position fix, C<0> otherwise. EGNOS/WAAS etc. satellites will
 always show as C<0>, even if their correction info was used.
 
+The passed hash references are read-only.
+
 =item on_fix => $cb->({point})
 
 Called regularly (usually about once/second), even when there is no
@@ -318,15 +320,16 @@
 want more frequent updates, but not very useful to store, as the next fix
 might well be totally off.
 
-If the fix is older then C<$max_seconds> (default: C<1.9>) or if no fix is
-available, returns the empty list.
+If the fix is older then C<$max_seconds> (default: C<1.9> times the update
+interval, i.e. usually C<1.9> seconds) or if no fix is available, returns
+the empty list.
 
 =cut
 
 sub estimate {
    my ($self, $max) = @_;
 
-   $max ||= 1.9 unless defined $max;
+   $max ||= 1.9 * $self->{interval} unless defined $max;
 
    my $geo = $self->{geo_forward} ||= new Geo::Forward;