View Poll Results: What heading sensing device(s) do you have on your boat? Select all that apply
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Traditional magnetic compass
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60 |
85.71% |
Fluxgate compass
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43 |
61.43% |
Rate compass
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23 |
32.86% |
Satellite compass
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12 |
17.14% |
None (only use GPS or other)
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5 |
7.14% |
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09-18-2016, 05:30 PM
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#21
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Guru
City: Sarasota/Ft. Lauderdale
Join Date: Apr 2014
Posts: 5,438
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Quote:
Originally Posted by Heron
3 sources (Magnetic, AP and GPS).....all read differently. I've gotta get on that..
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They likely will never read exactly the same.
Nor should they in some cases.
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09-18-2016, 09:05 PM
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#22
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,092
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Interesting results in the poll so far.
- 20% don't have a traditional magnetic compass. I would have expected close to zero.
- 17% have sat compasses. That's more than I expected. I figured less than 10%.
- Unfortunately I didn't design the poll well enough to figure out what % have some sort of electronic compass (fluxgate, rate compass, or sat compass). 55% have fluxgates, so it's at least that many. And 40% have rate compasses. Some of those could have fluxgates too, but probably not all, so the percent with electronic compasses is somewhere between 55% and 95%.
__________________
MVTanglewood.com
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09-19-2016, 07:15 AM
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#23
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Guru
Join Date: Jun 2008
Posts: 5,037
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Magnetic compass at both helms, compass in autopilot, compass in chart plotter, compass in each of our smartphones. Oh and I forgot the compass in the binoculars.
Like the man with 2 watches...he never knows the exact time!
__________________
Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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09-22-2016, 11:58 AM
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#24
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Guru
City: st pete
Vessel Model: 430 Mainship
Join Date: Sep 2016
Posts: 3,502
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Quote:
Originally Posted by twistedtree
Interesting results in the poll so far.
- 20% don't have a traditional magnetic compass. I would have expected close to zero.
- 17% have sat compasses. That's more than I expected. I figured less than 10%.
- Unfortunately I didn't design the poll well enough to figure out what % have some sort of electronic compass (fluxgate, rate compass, or sat compass). 55% have fluxgates, so it's at least that many. And 40% have rate compasses. Some of those could have fluxgates too, but probably not all, so the percent with electronic compasses is somewhere between 55% and 95%.
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Twistedtree,
Good poll and enlightening.
I'm also surprise that 100% don't have a whisky compass. Also surprised how many have fluxgate/or rate compasses.... might suspect a lot were necessary for AP or radar input.
__________________
Seevee
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09-22-2016, 12:11 PM
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#25
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Guru
City: League City, TX
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 1,069
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When I participated in the poll, I entered "Rate compass" before I actually read the question and saw "Select all that apply", and there is no way to correct after the fact. 4 fingers of scotch does that to me.
I actually have Rate, Fluxgate (standby) and Magnetic compasses onboard. I wonder if I'm the only participant that did that
__________________
Larry
M/V Pelago
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09-22-2016, 12:53 PM
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#26
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Guru
City: North Carolina for now
Join Date: Aug 2011
Posts: 6,348
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Based on a prior thread I still wonder how many say they have a "satellite compass" but really only have a GPS plotter. Perhaps those who answered that they have a sat comp, could give us the brand and model and how they use it?
__________________
George
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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09-22-2016, 01:18 PM
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#27
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Dauntless Award
City: Wrangell, Alaska
Vessel Name: Dauntless
Vessel Model: Kadey Krogen 42 - 148
Join Date: Jan 2013
Posts: 2,820
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Quote:
Originally Posted by twistedtree
Interesting results in the poll so far.
- 20% don't have a traditional magnetic compass. I would have expected close to zero.
- 17% have sat compasses. That's more than I expected. I figured less than 10%.
- Unfortunately I didn't design the poll well enough to figure out what % have some sort of electronic compass (fluxgate, rate compass, or sat compass). 55% have fluxgates, so it's at least that many. And 40% have rate compasses. Some of those could have fluxgates too, but probably not all, so the percent with electronic compasses is somewhere between 55% and 95%.
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Most of the above.
Com Nav now gets its compass from Maretron solid state compass. Works much better than Flux gate, which is standby.
Three more gps compasses, radar, vhf radios.
Plus my tablet gps and cell gps that both have Navionics charts.
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09-22-2016, 01:39 PM
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#28
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Guru
City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,264
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I installed several compass apps on my android phone for fun.
I just never need a compass, I have my GPS and OpenCpn with ENC charts from NOAA free, and Cmap, on a PC screen.
Actually only would use a compass if all my charts broke and then I still wont know exactly where I am.
I also have several ENC chart apps installed on my android S4 phone as backup. They plot my course and show me where I am.
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09-22-2016, 03:38 PM
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#29
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,092
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Quote:
Originally Posted by caltexflanc
Based on a prior thread I still wonder how many say they have a "satellite compass" but really only have a GPS plotter. Perhaps those who answered that they have a sat comp, could give us the brand and model and how they use it?
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Good question, and I think you are correct. i see lots of people referring to their "gps compass" or something similar. Most likely they are talking about the course over ground reported by a GPS when it's moving, and only when its moving. COS is not necessarily the same as HDG.
And to seevee's comment, I agree that it's likely an autopilot or radar that has motivated the installation of an electronic compass of some sort.
Getting back to sat compasses, we have a Hemisphere V103 which is the same as a comnav G2, simrad HS80, and pretty much all other comparable devices other than Furuno who make their own.
__________________
MVTanglewood.com
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09-22-2016, 04:46 PM
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#30
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Guru
City: West Coast
Join Date: Apr 2014
Posts: 1,790
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Quote:
Originally Posted by caltexflanc
Based on a prior thread I still wonder how many say they have a "satellite compass" but really only have a GPS plotter. Perhaps those who answered that they have a sat comp, could give us the brand and model and how they use it?
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Furuno SC-50 on my boat. My autopilot, AIS, chart plotter and radar use it by default. I believe my chartplotter (or, more accurately, my NN3D network) provides position, time and other nav info to radios and other equipment, and I believe that it gets all of that info, by default, from the sat compass.
Now that I think about it, the scanning sonar (which is not an NN3D peripheral) adjusts for pitch and roll, and gets that information from the sat compass, too. There are probably other uses I am forgetting.
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09-22-2016, 07:26 PM
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#31
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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Quote:
Originally Posted by LarryM
When I participated in the poll, I entered "Rate compass" before I actually read the question and saw "Select all that apply", and there is no way to correct after the fact. 4 fingers of scotch does that to me.
I actually have Rate, Fluxgate (standby) and Magnetic compasses onboard. I wonder if I'm the only participant that did that
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+1
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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09-22-2016, 08:34 PM
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#32
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,092
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So we definitely have some polling errors, which is probably true of every poll.
Does anyone want to fess up to not having a traditional magnetic compass, aka a whiskey compass?
Any by the way, where does the term "whiskey compass" come from? Would people use whiskey as the dampening fluid? Or is it something else? I had never heard the term until this thread.
__________________
MVTanglewood.com
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09-22-2016, 08:36 PM
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#33
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,149
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Quote:
Originally Posted by twistedtree
So we definitely have some polling errors, which is probably true of every poll.
Does anyone want to fess up to not having a traditional magnetic compass, aka a whiskey compass?
Any by the way, where does the term "whiskey compass" come from? Would people use whiskey as the dampening fluid? Or is it something else? I had never heard the term until this thread.
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Me either ...not in the USCG or baby boat commercial world. Will be interesting....
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09-22-2016, 08:41 PM
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#34
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Guru
City: San Diego
Vessel Name: Circuit Breaker
Vessel Model: 2021..22' Duffy Cuddy cabin
Join Date: Oct 2007
Posts: 6,691
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Quote:
Originally Posted by LarryM
When I participated in the poll, I entered "Rate compass" before I actually read the question and saw "Select all that apply", and there is no way to correct after the fact. 4 fingers of scotch does that to me.
I actually have Rate, Fluxgate (standby) and Magnetic compasses onboard. I wonder if I'm the only participant that did that
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I did too , Larry but in my defense i only had 3 fingers of scotch!
__________________
Done with diesel power boats! Have fallen in love with all electric!
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09-22-2016, 09:22 PM
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#35
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Guru
City: League City, TX
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 1,069
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Quote:
Originally Posted by Codger2
I did too , Larry but in my defense i only had 3 fingers of scotch!
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3 fingers, 4 fingers . . . could this be the real origin of term "Whiskey Compass?"
__________________
Larry
M/V Pelago
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09-22-2016, 09:45 PM
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#36
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Guru
City: League City, TX
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 1,069
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Quote:
Originally Posted by twistedtree
So we definitely have some polling errors, which is probably true of every poll.
Does anyone want to fess up to not having a traditional magnetic compass, aka a whiskey compass?
Any by the way, where does the term "whiskey compass" come from? Would people use whiskey as the dampening fluid? Or is it something else? I had never heard the term until this thread.
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A quick Google search found:
"One theory out there about why the standby (magnetic) compass on an airplane earned the name whiskey compass is that the name served to remind a pilot to refill a compass that lost its fluid with whiskey and not water because of its lower freezing level. Supposedly this is when airplanes lacked pressurization and heating."
"Another theory says that the standby compass is filled with kerosene earning the name Wet Compass. In aviation Phonetics, Whiskey is for W, explaining Whiskey Compass or W-Compass."
__________________
Larry
M/V Pelago
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09-22-2016, 11:09 PM
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#37
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TF Site Team
City: Ex-Brisbane, (Australia), now Bribie Island, Qld
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 10,101
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Quote:
Originally Posted by jleonard
Magnetic compass at both helms, compass in autopilot, compass in chart plotter, compass in each of our smartphones. Oh and I forgot the compass in the binoculars.
Like the man with 2 watches...he never knows the exact time!
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So...you could say, a pretty all encompassing set-up..?
__________________
Pete
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09-23-2016, 08:20 PM
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#38
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TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,663
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I haven't responded to the poll.
1 I have never heard of a "rate compass" until this thread. I doubt that i have one.
2 I have heard of a "Fluxgate compass", but when I look up "Raymarine Autopilot" to confirm that mine uses a Fluxgate, their site describes only their latest offerings, and calls the heading sensor a "Digital Compass".
3 I have never heard of a "Sattelite Compass". I expect that term to describe the directional information your GPS displays, but that information is only available when your GPS is in motion, so really isn't a compass.
4 I have a compass app on my phone, but it is again only a clever electronic means of displaying direction. It doesn't seem to need to be in motion, but it gives such a wide range of erroneous readings that it shouldn't count at all.
5 To have a proper "heading sensor" from your GPS, at least 2 separate GPS are required. Then when you are not in motion, the plot of the relative positions of the two receivers can be used to determine your heading. This is still not a kind of compass, but is a true "Heading Sensor". I don't have one.
I do have several magnetic compasses. I rarely refer to any of them.
I usually steer by using my autopilot to maintain heading along a route shown on my chart, displayed on my laptop screen. I think my autopilot refers to a fluxgate compass for its diretional information, and I know the chart program accept input from my GPS, so both of those are used at the same time. sometimes they even agree!
__________________
Keith
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09-23-2016, 08:27 PM
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#39
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,092
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Quote:
Originally Posted by koliver
I haven't responded to the poll.
1 I have never heard of a "rate compass" until this thread. I doubt that i have one.
2 I have heard of a "Fluxgate compass", but when I look up "Raymarine Autopilot" to confirm that mine uses a Fluxgate, their site describes only their latest offerings, and calls the heading sensor a "Digital Compass".
3 I have never heard of a "Sattelite Compass". I expect that term to describe the directional information your GPS displays, but that information is only available when your GPS is in motion, so really isn't a compass.
4 I have a compass app on my phone, but it is again only a clever electronic means of displaying direction. It doesn't seem to need to be in motion, but it gives such a wide range of erroneous readings that it shouldn't count at all.
5 To have a proper "heading sensor" from your GPS, at least 2 separate GPS are required. Then when you are not in motion, the plot of the relative positions of the two receivers can be used to determine your heading. This is still not a kind of compass, but is a true "Heading Sensor". I don't have one.
I do have several magnetic compasses. I rarely refer to any of them.
I usually steer by using my autopilot to maintain heading along a route shown on my chart, displayed on my laptop screen. I think my autopilot refers to a fluxgate compass for its diretional information, and I know the chart program accept input from my GPS, so both of those are used at the same time. sometimes they even agree!
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A "satellite compass" is what you describe in (5), plus some other stuff to make it work better.
__________________
MVTanglewood.com
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09-23-2016, 10:13 PM
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#40
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Four sources:
Fluid damped card compass
AP 35 with rate compass
Furuno GPS chart plotter
Laptop with Coastal Explorer and hockey-puck gps antenna
All are within a few deg of each other in calm conditions.
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