Cruisers Forum

Thread Tools Search this Thread Rate Thread Display Modes
Old 05-05-2021, 23:27   #1
Registered User

Join Date: Dec 2019
Location: Hobart, Tasmania
Boat: Beneteau 35
Posts: 13
GPS slow to find position

On my 2010 Beneteau 35 First, I have a Raymarine Tacktick wireless system with 3 displays on the mast and 3 more in the cockpit and a Raymarine ST70 autopilot. I've noticed that the Speed Over Ground info, which of course relies on the GPS, is often slow to display when the system first boots up. Generally, it takes about 5-10 minutes to show a reading, but last weekend in dense cloud and rain it took about 40 minutes to display. Could it be that the poor weather made the system slow to acquire the satellite signals ? (My Motorola phone GPS got a signal immediately) Is the GPS signal supplied by the autopilot or is it independent ? Has anyone else experienced this and is there anything I can do about it ? Thanks in advance for any help.
Tony Button is offline   Reply With Quote
Old 05-05-2021, 23:42   #2
Registered User

Join Date: Nov 2015
Location: Ireland
Posts: 363
Re: GPS slow to find position

Check to see if the system has a small battery in it to keep the clock alive when the power is turned off. If so it might need replacement. A GPS system can take a long time to get a fix if it doesn’t know the time and date.
AedanC is offline   Reply With Quote
Old 05-05-2021, 23:57   #3
Registered User
Alan Mighty's Avatar

Join Date: Mar 2014
Location: Moreton Bay
Boat: US$4,550 of lead under a GRP hull with cutter rig
Posts: 1,796
Re: GPS slow to find position

At least two possibilities:

* as AedanC noted, you may need to replace a battery in your GPS antenna (which may be independent or incorporated in something);


* you have a GPS antenna that was made marginally out-of-date by the 6 April 2019 week number roll-over. For which see:

Either are strong possibilities for equipment likely to be in a yacht built in or before 2010.
“Fools say that you can only gain experience at your own expense, but I have always contrived to gain my experience at the expense of others.” - Otto von Bismarck
Alan Mighty is offline   Reply With Quote
Old 06-05-2021, 00:07   #4
Senior Cruiser
SeanPatrick's Avatar

Cruisers Forum Supporter

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 344
Re: GPS slow to find position

^What they said.
If you have any questions about celestial navigation, ask me!
Celestial Navigation Spreadsheet

NavList Celestial Navigation Forum
SeanPatrick is offline   Reply With Quote
Old 06-05-2021, 09:59   #5
Registered User

Join Date: Nov 2013
Location: Brookhaven, NY
Boat: Pearson 34-2
Posts: 214
Re: GPS slow to find position

I have a very similar issue on our boat. I was unaware of the roll-over, so thank you for that! We have a Lowrance HDS5 mounted at the chart table using it's internal antenna. It takes about 10 minutes to acquire enough satellites to get going with positioning. It is older than the last rollover date. Is it an issue that the antenna is down below?

PS: I do not mean to hijack thread, but we both may have same problem, just a different perspective.
fred4936 is offline   Reply With Quote
Old 06-05-2021, 13:14   #6
Registered User

Join Date: May 2015
Location: Whangarei
Boat: Bavaria 38 Cruiser, 12meters, 2004
Posts: 193
Re: GPS slow to find position

I had a similar problem with my Raystar antenna. The problem is now fixed because I bought a Vesper Cortex AIS which comes with it's own GPS antenna and now feeds that information to the Raymarine plotter and network. However as an exercise I pulled the Raystar antenna out and prized off the old battery which was spot welded in and fitted a battery and battery holder that just clips in for ease of replacement.

All this information is on prior threads on CF.
Kerry1 is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Icom VHF slow GPS fix while moving mirsebfo Marine Electronics 3 10-01-2021 08:10
No GPS connected, but $ECRMC shows GPS Position? Dos OpenCPN 6 30-04-2019 15:06
Best are to find crew position in florida? rgerl83 Atlantic & the Caribbean 0 15-01-2014 13:37
OpenCPN Sync with GPS is Slow / Buggy eric.toupin OpenCPN 7 03-12-2010 16:15
Engine Slow = Boat Slow Ex-Calif Propellers & Drive Systems 5 02-10-2007 11:25

Advertise Here

All times are GMT -7. The time now is 04:46.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.