Thread Tools Search this Thread Display Modes
Old 01-24-2009, 10:48 AM   #1
Nomad Willy's Avatar
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,659
GPS / snow ?

**** I'm about to go to Ketchikan and the forcast is snow and rain showers. So far I havent been in snow, underway with rthe boat. My TV antenna dies at the house*with considerable wet snow and I would expect the GPS with it's small antenna to not work as well. Without GPS I'll probably go for the radar but the same would seem to apply to that as well. With no GPS and no radar I'll be with my compass, last known position and depth sounders. Also if the snow is heavy I won't see squat.

Eric Henning
Nomad Willy is online now   Reply With Quote
Old 01-24-2009, 12:00 PM   #2
TF Site Team/Forum Founder
Baker's Avatar
City: League City, Tx
Vessel Name: Floatsome & Jetsome
Vessel Model: Meridian 411
Join Date: Oct 2007
Posts: 7,296
GPS / snow ?

Eric, I have never heard of snow "attenuating" a GPS signal. I have no clue what frequency range the GPS signal is broadcast in but I would think that would one of the places to start. Also, your TV signal is one transmitter and one reciever. The GPS system has many satellites and you only need a few for proper operation. I am just shooting in the dark here. My uneducated guess would be that snow would not be a threat to the GPS signal.

Here is the first link in my google search:

I would suggest going to google and do:*** google+snow****

You may get a tighter search if you put it in quotes.* But I think there is tons of info there...TONS!!!

Whoops.....I just saw my mistake.* I meant,*** GPS+SNOW** !!!!

-- Edited by Baker at 10:02, 2009-01-27
Baker is offline   Reply With Quote
Old 01-27-2009, 07:30 AM   #3
Capn Chuck's Avatar
Join Date: Jan 2009
Posts: 897
RE: GPS / snow ?

Eric, Neither rain nor snow nor dark of night should affect your GPS and if anything does it is an antenna issue and not conditions. Have fun
Capn Chuck is offline   Reply With Quote
Old 01-27-2009, 06:24 PM   #4
Nomad Willy's Avatar
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,659
RE: GPS / snow ?

Hi guys,

Thanks for the uplifting thoughts on snow/GPS. I leave at O dark thirty in the morning for Ketchikan and snow is prominent in the forecast. I riged a life line ( fixed ) to make it easier to wipe the snow off the little mushroom guy up on the radar arch if nessessary when it's rough. Welcome to the site Chuck. Looks like you've got stuff to share .. good. We've got lots of fiction and fact to sling around here.

Eric Henning
Nomad Willy is online now   Reply With Quote
Old 01-27-2009, 07:00 PM   #5
Scraping Paint
City: -
Join Date: Oct 2007
Posts: 13,745
RE: GPS / snow ?


We've had our boat out in heavy rain and while it certainly affected the radar returns it had no effect whatsoever on the GPS. We never run our boat from the flying bridge so the heavy canvas cover stays on all the time when we're running. The two GPS antennas are mounted on the flying bridge consol underneath this cover, but they never miss a beat, even under the cover AND in heavy rain. I've also driven a car in France in heavy rain and mixed snow at 60-plus mph and this had no effect whatsoever on the GPS nav system in the car. So I will be very surprised if you experience any interuption or inaccuracy of your GPS system in the snow and rain you may encounter. Have a good trip.
Marin is offline   Reply With Quote
Old 01-29-2009, 08:52 PM   #6
Senior Member
Chris Foster's Avatar
City: Anacortes, WA
Vessel Name: Thea
Vessel Model: 46 Grand Banks Classic
Join Date: Oct 2007
Posts: 280
RE: GPS / snow ?

GPS frequency is 1.5 and 1.2 GHz, so its shortest wavelength is about .2 meters, or about 8 inches.

Radio signals peneterate water to about 1/8 of the wavelength, or about an inch at 1.5 GHz.* Not many raindrops are that big!* Not to say that an extremely heavy downpour won't cause some attenuation, but in general, you'll never see it with a good antenna and coax.

Radar is up at about 10 GHz - now your wavelength is under an inch, and 1/8 wavelength around a tenth of an inch.* A good heavy rain now becomes significant.
Chris Foster is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
snow crab skipperdude Voyagers and other Boaters on the Go! 11 03-22-2012 09:15 AM
Neat article about the ICW and Snow's Cut Tom.B General Discussion 5 03-11-2012 11:54 AM
Snow Day Budds Outlet Harbor Chat 21 01-20-2012 11:26 PM
Gps albin43 Electrical and Electronics & Navigation 25 04-19-2010 06:29 PM
Snow load skipperdude General Discussion 14 01-07-2010 12:07 PM

» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program

All times are GMT -5. The time now is 04:00 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012