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garmin 7400 chart help

Old 12-31-2016, 07:13 PM
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Default garmin 7400 chart help

Hi guys. Hoping some1 might be able to help with this.... I do alot of drift fishing, and use my heading on the garmin to determine my drift line to drift perfectly over a rock /school of fish, but the heading/bearing on my garmin 7412 seems to stall and not read what direction I'm drifting at drifting speeds. It's fine when under power, but as soon as I start slow drifting it won't update with my current direction of drift/heading. My understanding was that these units update position 10 times a second? Please help! Thanks in advance.
Old 12-31-2016, 09:11 PM
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I suggest adding a heading sensor to the system.
Old 12-31-2016, 11:05 PM
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You could also try setting the screen to North Up as opposed to Course Up.
Old 12-31-2016, 11:18 PM
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When you're moving very slowly, "Heading" based on GPS data will be all over the place due to GPS errors. The update rate doesnt help.

If you add a "Heading Sensor", the compass in it will tell you which way the bow is pointed, but wont help much with which way the boat is drifting. COG (course over ground) is still determined by the GPS, and is still subject to the same errors at low speeds.

If you turn on "Tracks" the chart page will show a plot that is accurate as far as which way the boat is actually moving over time. The Heading readout will not be reliable until you speed up some though.
Old 12-31-2016, 11:20 PM
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Also, I agree that if you change to North UP the chart wont be spinning all around which will help.
Old 01-01-2017, 12:15 AM
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Hey thanks everyone for the advice. Really appreciate it. I do have the map set to north up,and do have tracks on. Just quite frustrating as to why the heading degrees freezes(it won't change at all until I power of at speed. Is it strange or is there something wrong with the unit that it 'freezes' on a certain bearing degrees and doesn't change AT ALL?? and won't change once I'm drifting (my old chartplotter would still give me a heading degrees even when I was just drifting.
Old 01-01-2017, 01:31 AM
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Cant help with that one.

When Im working a waypoint, I never pay any attention to the heading or COG in degrees even if Im moving fast enough for them to be accurate. I have no use for that information. The only thing that matters is where is the boat in relation to the waypoint.The track gives me what I need to know much better than a direction in the form of a number. The COG arrow on the chart can be handy, but again, thats useless if you're moving too slow.

That said, there may be a setting concerning heading or COG under the GPS menu somewhere that tells the unit when to stop giving heading if the GPS data is too inacurate, but I dont remember for sure. You might try RTFM and see what pops up.

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