Quote Originally Posted by Cane Pole View Post
I sometimes "slow troll" at .3/.4mph, especially trolling shallow drops or brush. I do a lot of KY rigging too. At these speeds, HB pointer icon turns into a circle (indicating no movement).
Between .5/.6 mph, the HB jumps between the donut and the boat icon. This gives a lot of yes-no-yes-no-yes-no's.
I quit using the HB gps for trolling and use it as the goto gps when I move to another distant location.

When I tried this with the HDS, it hung in there at the lower speeds. This is not because of the actual physical accuracy, but because of programmed anticipatory algorithms.

If you loose your direction arrow, screen refresh rate don't amount to hill of beans.

The donut is just a nuisance.
I'm still confused why you need the chart went trolling, but will take your word for it that you need it.

When I'm trolling up and down a stump field, I've popped over to the chart to see that the breadcrumbs have shown me to have covered the area like I want, but haven't left it on chart.

But I've just started using this unit, so I may see the need once I get a few more hours on it.