Join the C34 Association Today!
[C34 Home] [C34Tech Notes] [C34 Tech Wiki] [Join!]
Please login or register.
Advanced search  

News:

Pages: 1 2 [3]   Go Down

Author Topic: GPSmap 172c --- GPS Replacement Options  (Read 785 times)

0 Members and 1 Guest are viewing this topic.

Ted Pounds

  • Forum - Chief Petty Officer
  • ******
  • Karma: 8
  • Posts: 817
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #30 on: September 17, 2019, 07:11:10 PM »

Currently cruising the Rideau Canal and associated lakes on a houseboat. The navigation system is an iPad with no cell service and internal GPS. It uses Navionics chart app. It is left plugged in continuously to a USB charge port at the helm station.  It also has a waterproof case.  It is an outstanding navigation aid. Better than what I use flying the B-787. I can’t imagine a better system at any price. 
Logged
Ted Pounds
"Molly Rose"
1987 #447

KWKloeber

  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 32
  • Posts: 3391
  • "Positive Impact" 1984 C-30 #3573 trbsfk M-25
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #31 on: September 17, 2019, 07:56:54 PM »

Quote

use an iPad as a chart plotter.


Just an FYI.  You have to be careful about iPads and GPS.  (Unless Apple has changed its ways) only the cell-enabled iPads have an internal GPS chip.  The WiFi (only) iPads don't -- they use wifi networks and cell towers (even w/o an active cell contract) to determine the "gps" location, so it can at times be very approximate.  Even the iPads w/ gps chips initially use WiFi and cell to get the first (approximate) location (recall that your gps takes a while to lock onto enough satellites to start displaying a good location. So when first turned on, an iPad couldn't possibly lock onto GPS as quickly as it appears to find the location -- it's fooling us.)
« Last Edit: September 17, 2019, 07:57:49 PM by KWKloeber »
Logged
Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

Stu Jackson

  • C34IA - Secretary
  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 68
  • Posts: 7484
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #32 on: September 17, 2019, 08:13:02 PM »

There have been, and will continue to be, detailed discussions about this topic.  Kinda like asking your mom what girl to marry before you've had a first date, or "What boat should I buy?"  :D

Here's another good recent one:

http://www.cruisersforum.com/forums/f13/new-iphones-and-the-imminent-death-of-the-mfd-223683.html
Logged
Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

"There is no problem so great that it can't be solved."

Noah

  • Administrator
  • Forum - Master Chief Petty Officer
  • *******
  • Karma: 19
  • Posts: 1555
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #33 on: September 18, 2019, 02:19:45 PM »

Ken— that is why I mentioned using a GPs plugin/dongle device for iPad such as a Garmin or Bad Elf add-on.
Logged
1990 hull #1014, San Diego, CA,  Fin Keel,
Standard Rig

mark_53

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 352
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #34 on: September 19, 2019, 08:42:02 AM »

Quote

use an iPad as a chart plotter.


Just an FYI.  You have to be careful about iPads and GPS.  (Unless Apple has changed its ways) only the cell-enabled iPads have an internal GPS chip.  The WiFi (only) iPads don't -- they use wifi networks and cell towers (even w/o an active cell contract) to determine the "gps" location, so it can at times be very approximate.  Even the iPads w/ gps chips initially use WiFi and cell to get the first (approximate) location (recall that your gps takes a while to lock onto enough satellites to start displaying a good location. So when first turned on, an iPad couldn't possibly lock onto GPS as quickly as it appears to find the location -- it's fooling us.)


The iPad Air uses (both wireless and cellular) GLONASS for out of coverage location data.  Here's the specs from Apple...


Wi-Fi + Cellular models

    Assisted GPS, GLONASS, Galileo, and QZSS
    Cellular
Logged
1989 C34 Mk1 M25XP

The Green New Deal is coming...just keept the government out of the way!

DaveBMusik

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 230
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #35 on: September 19, 2019, 06:51:08 PM »

I use a Garmin 4210 at the helm. I purchased a year old Chart SD card for about $99 (Garmin will update it to the newest version one time). I installed a Vesper 8000 AIS which includes a WiFi signal. I use Aqua Map on my iPad which is one of the few programs that will accept the Vespers GPS location (no cellular version needed although mine is). Aqua Map also updates all the Active Captain info. I also have the Garmin 78 handheld as a third backup (which I have only used in the dinghy to get back to the boat in the fog :) ).
So, I have one year old charts on my 4210 at the helm with it's GPS Antenna reading AIS info from the Vesper, I have my iPad available using AquaMap and Navionics for problem areas (where updated info is crucial) as well as for AIS and Active Captain using the Vesper's GPS Antenna, the iPad's own cellular GPS antenna if the ship's electronics go out, my rarely used 78 and then (gasp) paper charts.
Logged
Dave Burgess
Water Music
1986 C34 Hull #206, Fin Keel
Yanmar 3YM30
Noank, CT

KWKloeber

  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 32
  • Posts: 3391
  • "Positive Impact" 1984 C-30 #3573 trbsfk M-25
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #36 on: September 19, 2019, 07:39:29 PM »


Ken— that is why I mentioned using a GPs plugin/dongle device for iPad such as a Garmin or Bad Elf add-on.


[something else that I didn't realize - When you use an iPhone or iPad to geotag a photo, the accuracy is about 100 feet (about 30 meters), because Apple only stores GPS data down to the nearest second in latitude and longitude - geospatialexperts.com/ipad-gps/]

AhhhSo -- I didn't take it that you were referring to the WiFi (only) pads.  Just wanted to peeps who might be considering a WiFi only, realize that after all that, they'd need tpo plunk down another bill after the fact to get gps.

The last time I looked into this, I recall there were issues with the iPad (or maybe it was specific apps) being able to use or accept any old tethered external gps - hopefully, that is much better now.

-k
« Last Edit: September 19, 2019, 07:54:52 PM by KWKloeber »
Logged
Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

DaveBMusik

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 230
    • View Profile
Re: GPSmap 172c --- GPS Replacement Options
« Reply #37 on: September 20, 2019, 08:42:52 AM »

Quote

use an iPad as a chart plotter.


Just an FYI.  You have to be careful about iPads and GPS.  (Unless Apple has changed its ways) only the cell-enabled iPads have an internal GPS chip.  The WiFi (only) iPads don't -- they use wifi networks and cell towers (even w/o an active cell contract) to determine the "gps" location, so it can at times be very approximate.  Even the iPads w/ gps chips initially use WiFi and cell to get the first (approximate) location (recall that your gps takes a while to lock onto enough satellites to start displaying a good location. So when first turned on, an iPad couldn't possibly lock onto GPS as quickly as it appears to find the location -- it's fooling us.)


The iPad Air uses (both wireless and cellular) GLONASS for out of coverage location data.  Here's the specs from Apple...


Wi-Fi + Cellular models

    Assisted GPS, GLONASS, Galileo, and QZSS
    Cellular

From Apple:

Location
Wi-Fi
Digital compass
Wi‑Fi
iBeacon microlocation

Wi‑Fi + Cellular
Digital compass
Wi‑Fi
Assisted GPS and GLONASS
Cellular
iBeacon microlocation

I take this to be as it always has been, you need to have the cellular version on order to have wifi OR external dongle OR wireless signal from an external GPS such as the Vesper 8000 AIS
Logged
Dave Burgess
Water Music
1986 C34 Hull #206, Fin Keel
Yanmar 3YM30
Noank, CT
Pages: 1 2 [3]   Go Up