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Old 31 May 2017, 06:38   #1
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Auto Guidance Garmin

I have a Garmin 451s with the Blue Vision card in place,
When I choose a safe waypoint and then auto guidance I get the error message
unable to plot route unless I am about a mile away from any obstacle at start or finishing waypoint.
I have set my boat to min depth 1.5m, shoreline near and min high of 2.5m.
The route to guidance works fine but would direct through land unless you manually input a saved route.
So is auto guidance useless or am i missing something?
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Old 31 May 2017, 09:23   #2
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Auto guidance from most Garmin plotters (I use a 95SV) only is available when you use the Blue Chart G2 Vision HD charts ................ this is certainly the case with the later plotters that use auto Guidance V3 technology .......... yours is quite an old plotter now, but I seem to remember that you would need an upgrade chart.

I always smack in a few waypoints and use 'navigate to' for each waypoint.

I am the one who is responsible for shallow water and hazard avoidance .......... I wouldnt want to leave those decisions to a plotter !

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Old 31 May 2017, 09:31   #3
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Yes it is a Garmin Blue Chart G2 Vision card, 5 years old now though
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Old 31 May 2017, 10:15   #4
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Quote:
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Yes it is a Garmin Blue Chart G2 Vision card, 5 years old now though
I think it needs to be the Blue Chart G2 Vision 'HD' (high Definition)version, which is quite expensive (£200+ last time I looked)
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Old 31 May 2017, 11:49   #5
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i have a pair of garmin plotters with g2 HD on them, mines will also happily take you over land. I've never bothered messing with it but I assume it is user error, it has to be better than that.

my boat is away for new seats being fitted but i'll have another look when it comes back.
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Old 31 May 2017, 12:09   #6
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i have a pair of garmin plotters with g2 HD on them, mines will also happily take you over land. I've never bothered messing with it but I assume it is user error, it has to be better than that.

my boat is away for new seats being fitted but i'll have another look when it comes back.

Probably not user error, as you have to enter a fair few parameters to set it up correctly ...... even tehn, it will come up with a numer of warnings and disclaimers ........... however, I think any coastal passage should be the skippers responsibilty and not entrusted to a plotter !

Having said that ............ I still think that Garmin plotters and sonar are one of the easiest and most intuitive to use ............
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Old 31 May 2017, 12:39   #7
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Why shouldn't you trust the plotter? It is how most of us navigate and knowledge/compass as a backup. I don't even have paper charts rightly or wrongly!

If I'm using it correctly the garmin auto navigation sucks, I've barely even tried it as I manually enter points but that is still trusting the plotter.
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Old 31 May 2017, 13:12   #8
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We have garmin plotters in our hard boat and the rib. It depends on whether you select route to or guide to,
Route to will draw a straight line to the destination you then pull the route to your chosen turn points
I usually use guide to which plots the course and puts in the turns it works fine but always seems a bit close to shore for comfort and I usually run outside of the course .To be fair though the course is always through safe water
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Old 31 May 2017, 15:49   #9
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Why shouldn't you trust the plotter?
Well, it doesn't have any skin in the game
You shouldn't trust them because they haven't a baldy about the water you're about to transit. They know how deep it is - that's it. They don't know/care about tidal races, high traffic areas, MOD exclusion zones, contours that are heavily potted and a host of other things you do/should know.

Used carefully and thoughtfully, I can see how it might work well. I have it but have never felt the need.
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Old 31 May 2017, 16:49   #10
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i can only speak about garmin as that is all i have had exposure to recently but tidal info, MOD exclusions are on there or atleast as upto date as the last card update anyway.

you said it knows depth...so you trust it for something.

ofcourse preparation for the voyage is still a very worthwhile exercise as it isn't unknown for plotters to fail or lose GPS, but whilst underway i would trust it if the compass is pointing where i'm expecting it.

in my case it would be nice if it worked to maybe help mrs get home/safety in case something happens so i'll have a look at it again. TBH that is pretty much only reason i wanted to make use of the auto feature.
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