From: Virtanen Janne <
[email protected]>
Sent: 20 June 2017 10:24
To: Olavi Heinlo
Cc: Triin Rebane; Darja G�nter; Dana Kuznetsova; Patrakka Jouni; Leo
K��rmann
Subject: VS: Ristna DGPS - Navigational warning (important)
Hello Olavi
Thank you for your mail. If we get some information about unreliability,
we will inform you.
Best regards
Janne
Janne Virtanen
Ryhm�p��llikk�, Laadunvalvonta/Merikarttojen p�ivitys
Merivaroituskoordinaattori
Liikennevirasto
Liikenne ja tieto, Liikenteen palvelut, Merikartoituspalvelut-yksikk�
PL 33, 00521 HELSINKI (Opastinsilta 12 A)
Puh. 0295 34 3489
janne.virtanen(at)liikennevirasto.fi
www.liikennevirasto.fi
L�hett�j�: Olavi Heinlo [mailto:
[email protected]]
L�hetetty: 19. kes�kuuta 2017 10:36
Vastaanottaja: Virtanen Janne
Kopio: Triin Rebane; Darja G�nter; Dana Kuznetsova; Patrakka Jouni; Leo
K��rmann
Aihe: RE: Ristna DGPS - Navigational warning (important)
Hello Janne,
We have tested the Ristna DGPS system for two weeks now and we have not
discovered an error that could be
dangerous to navigation. Also we have not received any feedback from you
or navigators that is based on a
specific case of false location transmission. Therefore we will cancel
our warning no 55 about the possibly
unreliable Ristna DGPS station.
If you encounter any further information about the unreliability of the
Ristna DGPS station, please inform us
with as detailed information as possible, so we can compare this data to
our monitoring results and if
necessary restore the warning about the unreliability of the DGPS
station.
Best regards,
Olavi
From: Virtanen Janne [mailto:
[email protected]]
Sent: Thursday, May 18, 2017 11:36 AM
To: Olavi Heinlo <
[email protected]>; Patrakka Jouni
<
[email protected]>
Cc: Darja G�nter <
[email protected]>
Subject: VS: Ristna DGPS - Navigational warning (important)
Hello!
Jouni, do you have some more information about this for Olavi?
Janne
L�hett�j�: Olavi Heinlo [mailto:
[email protected]]
L�hetetty: 18. toukokuuta 2017 11:35
Vastaanottaja: Virtanen Janne
Kopio: Darja G�nter
Aihe: RE: Ristna DGPS - Navigational warning (important)
Hello Janne!
Do you have some case based information about the unreliability?
Olavi
From: Virtanen Janne [mailto:
[email protected]]
Sent: Thursday, May 18, 2017 11:19 AM
To: Olavi Heinlo <
[email protected]>
Subject: Ristna DGPS - Navigational warning (important)
Importance: High
Hello Olavi!
We got some information, that Ristna DGPS station is transmitting false
data occasionally. Error can
be even 200m. Do you know about this, and are you going to do
navigational warning to navtex of this
issue?
I hope you response soon this email and hear from you.
Best regards
Janne Virtanen
Team Manager, Master Mariner
Nautical Chart Quality Control, Chart updating, National Coordinator of
Navigational Warnings
Finnish Transport Agency
Hydrographic Office
P.O. Box 33, 00521 Helsinki
FINLAND
Tel. +358 20 637 3489
janne.virtanen(at)fta.fi
www.liikennevirasto.fi