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Garmin GPS 72H

Printed From: Yachts and Yachting Online
Category: General
Forum Name: Race Management
Forum Discription: For race officers and competiors to discuss the topic
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=11553
Printed Date: 03 Oct 22 at 2:42am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com


Topic: Garmin GPS 72H
Posted By: Buzz
Subject: Garmin GPS 72H
Date Posted: 14 Jul 14 at 4:42pm
Could anyone recommend where I could find a detailed set of instructions on how to use the above GPS please. The manual that comes with it is useless. I want to use it for laying marks.



Replies:
Posted By: Brass
Date Posted: 15 Jul 14 at 4:02am
https://support.garmin.com/support/manuals/searchManuals.faces

See, that wasn't so hard to Google was it?


Posted By: Buzz
Date Posted: 15 Jul 14 at 10:28am
My original post was prompted by the lack of detail in the Garmnin getting started manual and the owners manual both of which which I downloaded when I got the GPS. I was hoping that someone might know for have a really detaied manual or book. I have also looked through numerous YouTube videos but I was unable to find what I wanted.


Posted By: Medway Maniac
Date Posted: 15 Jul 14 at 10:38am
Originally posted by Buzz



My original post was prompted by the lack of detail in the Garmnin getting started manual and the owners manual both of which which I downloaded when I got the GPS. I was hoping that someone might know for have a really detaied manual or book. I have also looked through numerous YouTube videos but I was unable to find what I wanted.

Sounds like the usual story with Garmin GPS. I have usually found a website where someone describes the functions and tricks, at least for the cycling products, but the manuals are hopeless.

Otherwise, it is just the use of trial and error and intelligence, I'm afraid, unless you're lucky enough to meet someone with the same unit.

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http://www.wilsoniansc.org.uk" rel="nofollow - Wilsonian SC
http://www.3000class.org.uk" rel="nofollow - 3000 Class


Posted By: winging it
Date Posted: 15 Jul 14 at 9:25pm
We did a mark laying course using these not very long ago, I got a handout with it which could be scanned and forwarded.  Pm me your email address?

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the same, but different...



Posted By: Brass
Date Posted: 16 Jul 14 at 1:49am
I'm not sure that it's the keystroke sequences you need.  Mark laying with a GPS doesn't need any very sophisticated use of the GPS.  You can get by with just Pinging a position, setting GO TO and display of bearing and distance to a waypoint.  Using Project Location is a bonus.

You can't expect the Garmin manuals to tell you how to use a GPS to lay marks, that's what your RYA RO or mark layers course will do.

The ISAF http://www.sailing.org/tools/documents/RMManual2012-%5b12283%5d.pdf" rel="nofollow - Race Management Manual (RMM) contains all you really need to know.

Marks can be laid by GPS using the following methods
  • specific coordinates (RMM L4 ( a ))
  • Bearing and Distance from Reference Point (RP)
-  Sequential Waypoints (RMM L4 ( b ))
-  Bearing and Distance from common RP (Appendix F9)

I prefer the common Reference Point method because it's simplest (very simple for 60 degree triangles and 70 degree trapezoids).

For what it's worth, here's what I do (a real RO or IML may come along and put me right).
  1. Set the GPS to the standard settings (RMM H5)
  2. Edit waypoints and add and delete dummy waypoints as necessary so that the first waypoint you will create on the water, which will be the RP, will have a nice memorable number (on the even tens) and the waypoints you create for each mark, will end with the number of that mark as shown on the course diagram.  For example, suppose you already have 65 waypoints in your GPS, and you are going to use the RC Vessel as the RP.  Create and delete Waypoints 066, 067, 068, and 069, so that the next waypoint that you create will be 070.  You will thus be using the '70s' for your mark waypoints for the day.
  3. Go to the racing area, confirm with the RO that the RC Vessel is anchored in its correct position and Ping the RC vessel (Garmin Manual p 6 To Mark your Current Location).  This will create WP 070.
  4. Set the GPS to GO TO the RP (WP 070), with display showing Bearing and Distance to the waypoint.
  5. Get the approximate wind direction and expected windward leg length from the RO.
  6. Bog off upwind until your GPS shows Distance to RP = leg length or a little more.
  7. Drift, observe wind strength and direction and radio report to RO.  Repeat every 5 minutes or when wind changes are noticeable.
  8. Work out the reciprocal of the wind direction bearing and if necessary, manoeuvre your mark boat so your GPS shows this bearing to the RP and distance = the leg length.
  9. When you think the wind is settled, agree the Axis bearing and leg length with the RO, work out the reciprocal of the Axis, and manoeuvre your mark boat so that your GPS shows this bearing to the RP and distance = leg length.
  10. Set the mark, let it settle, check its correct location, then come along side it and Ping it.  It will now be WP 071.
  11. Using the RMM Appendix F9 tables or mental arithmetic, work out the reciprocal bearing and distance from the RP to the next mark to be laid (usually the wing mark).
  12. Go there, manoeuvre to get the reciprocal bearing and distance to the RP right, lay the mark, check and ping it (WP 072).
  13. Repeat for subsequent marks.


Posted By: Buzz
Date Posted: 16 Jul 14 at 2:07pm
Brass - thanks for your detailed reply and the link. I have a fair idea what I want to do but lack the detail on how to do it. I am going to see if I can find somone with the same GPS as me to compare notes.


Posted By: winging it
Date Posted: 16 Jul 14 at 7:21pm
Actually, it is the correct key stroke sequence that you need, because the 72h is not that intuitive, and if you wZnt yo get the marks laid or moved quickly, knowing the sequence of buttons to press is really helpful.  That's why we were given the handout.  

I'll get it copied and sent.


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the same, but different...



Posted By: Brass
Date Posted: 21 Jul 14 at 8:17am
Haven't seen the step by steps from Winging It yet.

The procedure I described requires only four GPS functions:
  1. Set Settings into standard ISAF RMM units
  2. Ping a position as a new waypoint
  3. Set GO TO a waypoint
  4. Set up Screen Layout and Data to show Bearing and Distance to a Waypoint.
Additionally, using Project Location to move a Waypoint to a specified bearing and distance from a known position is useful.

I think all these functions are pretty readily discovered from the user manual, but if you tell us which ones you can't do, then we can perhaps help you out.


Posted By: winging it
Date Posted: 21 Jul 14 at 11:04am
Ok, finally found my notes.  They are for the Garmin 76, the 72H is basically the updated version and is the unit we actually used.  The notes, from a powerpoint, go through how to set waypoints, clear them and go to them, which is basically all you need.  we then went out and used the reference system, where a boat provides a reference point and you proceed according to which marks you are laying.

I think it's all pretty straightforward, it's just remembering the essential keystrokes under pressure.


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the same, but different...



Posted By: Brass
Date Posted: 01 Aug 14 at 2:09am
As I said, using GPS for mark laying doesn't require any particularly sophisticated or difficult GPS functions.

Difficulty seems to lie in getting on top of the rather old-fashioned user interface.  Once you do that, I think it's actually pretty intuitive.

The button and screen interface on the GPS72H is NOT a graphical user interface like on a smartphone or a mouse-cursor interface.  It is an old fashioned, arrow-select, layered menu interface.  Think back to keypad driven mobile phones.

For starters, read Manual Conventions, and Tips and Shortcuts on the User Manual page i.

You use the Rocker moving up or down, left or right, to point to a screen [menu] item, and the ENTER key to select it.  So when the Manual says 'Select ....' it means 'Rocker the highlight to the required item and press ENTER'.

To execute a selection, press ENTER.  To go back one layer, press QUIT.

Understand that:
  • there are five display 'pages', illustrated and discussed in the Manual pages 13 to 19, and which you can 'page' through by pressing the Page button repeatedly;
  • context sensitive menus or submenus accessible by pressing the Menu key once;  and
  • a Main Menu accessible by pressing the Menu key twice (giving access to Settings discussed in the Manual pages 20 to 30)
Setting Units

Here is the detail for setting units, etc as required by RMM H5, which prescribes the following:
  • Distance in nautical miles
  • Time in local time zone 24 hour format
  • Compass bearing in magnetic
  • Lat and long in decimal minutes
  • Map datum WGS 84.
Open the Main Menu (Press Menu twice).

Rocker down  (or up once) to Setup, and select by pressing Enter.

You are now presented with a 'tabbed' screen, with the following 'tabs' across the top:  General, Time, Units, Location, Alarms, Interface.

Rocker right to the Time tab

Rocker down to Time Format and select by pressing Enter.

Rocker down to 24 Hr and select by pressing Enter.

Rocker down to Time Zone and select by pressing Enter.

Rocker down to the correct local time zone, or Other and select by pressing Enter

If you have selected Other, Rocker right to UTC Offset and select by pressing Enter

The plus/minus sign will now be highlighted:  rocker up or down to correct plus or minus for the local offset, then rocker right to move to the next digit and rocker up or down to the correct number, and repeat for the following digits:  when setting is complete, press Enter. (Read To Edit Text Using the Rocker on page 4 of the Manual).

Rocker up to the tab line at the top of the screen, and rocker right to Units

Rocker down to Distance and Speed and select by pressing Enter

Rocker up or down to Nautical (nm, kt, m) and select by pressing Enter

Rocker right or Left (from a one line option) will take you back to the tab line at the top of the screen.

Rocker right to Location

Rocker down to Location Format and select by pressing Enter

Rocker up or down to 'hddd^mm.mmm' and select by pressing Enter

Rocker down to Map Datum and select by pressing Enter

Rocker up or down to WGS 84 and select by pressing Enter

Rocker down to North Reference and select by pressing Enter

Rocker up or down to Magnetic and select by pressing Enter

You have now completed setting the required units.

Press QUIT and you will go back to the Main Menu, or else press Page, until you reach the page you want to see.

Setting Display Pages

This procedure is pretty much the same for all pages except GPS Information where the layout cannot be changed.

All you need is Bearing and Distance.

So, from the page you want to set up,  Press Menu

Rocker down to Setup Page Layout and select by pressing Enter

For my preference, rocker up or down to Small (2 rows) and select by pressing Enter

Again press Menu, Rocker down to Change Data Fields and select by pressing Enter

You will now see the screen, with the label of the first data field highlighted:  select by pressing Enter

Rocker up or down to Bearing and select by pressing Enter

Now, rocker right to the label of the second data field and select by pressing Enter

Rocker up or down to Distance and select by pressing Enter.

Press Quit or Page to get out of page setup and back to operating pages.

Note, you need to aware of GPS language and defined terms:  see Data Field Options on page 30 of the Manual, in particular:

Bearing:  the direction from your current location to a waypoint
Course:  the direction from the starting location to a waypoint
Track:  the direction of movement relative to a ground position (heading)

Also be aware of the difference between 'to Destination' referring the the final destination of a Route, that may be several Waypoints away, and 'to Next'  referring to the next Waypoint.  For this, use Distance to Next.

Ping and Go To

Ping means to record your current position (say alongside a Reference Point, like a race committee vessel) as a Waypoint on your GPS, or to put it another way, to create a Waypoint in the GPS at your current position.

The 72H (like most GPS) has a one-button facility to do this.

Come alongside the mark/boat that you wish to ping and press and hold Enter (that has 'Mark' written underneath it).  After a couple of seconds the Mark Waypoint screen will appear, with the new waypoint showing.

If you have done the create/delete process I described in my previous post so that the next Waypoint you created would be Waypoint xx0, that will be the number/ID of the waypoint you have just created and no further editing of the waypoint information will be necessary.

To set up Go To this waypoint Rocker down to the bottom row of buttons, and rocker right or left to GO TO and select by pressing Enter.

If you then Page to the screen you have set up showing Bearing and Distance to Waypoint, you are all set up to motor to the required (reciprocal) bearing and distance upwind.

If you want to Go To any other waypoint, you can use the Go To Button.

Hope this helps.



Posted By: Buzz
Date Posted: 12 Sep 14 at 1:15pm


Posted By: deadrock
Date Posted: 14 Sep 14 at 11:34pm
Keep your head out of the GPS and look at the course. One RO at a Laser Qualifier in the eastern Solent a few years ago laid the course by GPS without taking the tidal flow into account. (For those who've never sailed there, the tidal flow is quite strong.) Though the windward mark was almost directly to windward of the start-line, it could be laid on a close fetch.


Posted By: Brass
Date Posted: 15 Sep 14 at 12:32am
Originally posted by Buzz

Buzz,

Did the step by step do what you wanted?


Posted By: Brass
Date Posted: 15 Sep 14 at 12:34am
Originally posted by deadrock

Keep your head out of the GPS and look at the course. One RO at a Laser Qualifier in the eastern Solent a few years ago laid the course by GPS without taking the tidal flow into account. (For those who've never sailed there, the tidal flow is quite strong.) Though the windward mark was almost directly to windward of the start-line, it could be laid on a close fetch.
That's not caused by looking at a GPS.

It's caused by a RO taking a wind reading from an anchored start boat.

This is the reason the Race Management Manual tells us to take wind readings from a drifting boat.


Posted By: Buzz
Date Posted: 15 Sep 14 at 1:09pm
Brass,
 
The step by step guide worked perfectly.  I really appreciate the help. I can now Create a waypoint by the committee boat and project another waypoint on the bearing and distance I want. Then I hit GoTo to take me there.



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