Rainman2,
I am quite surprised by this especially with the Ottertail map. I use the Ottertail map myself and have found this map to be especially accurate. Many of the areas I fish in the NE areas of the lake are within a few feet of accuracy or are right on.
I even have a few guides on Ottertail who have used my map and have given me very positive feedback about the accuracy of the map.
I just want to verify you are speaking about Kirsch’s Outdoor Products or Kirsch’s Mapping Service Maps and not some other companies product.
If you are talking about my Ottertail map and are not satisfied, I always have a 100% money back guarantee. You are the first person to date that I have heard from that has not been happy with this map.
One other thing to try is to verify your GPS is set to Map Datum WGS 84 and it is set to Degrees, Min. If these were set incorrectly on the GPS, it could throw the spots off.
I haven’t changed the calibration of Ottertail for some time but if you are intertested, I can send you another copy if for some reason your copy is defective.
Just as an example, I have attached a picture that shows 2 trolling passes on 2 humps on Ottertail. These are not mock ups but actual track files from my GPS of when I was on Ottertail. Notice how the the trolling passes show up exactly on the humps. Not only was it right on, but the waypoint that I had marked on the top of this hump was right on. I did not include the waypoint on the picture as it would cover up the detail.
I merely drove out to the edge of the structure and started fishing around these two humps. The line connecting the two humps is simply the way I drove in between them so don’t be alarmed that it didn’t follow the structure.
My calibration is only as good as the base DNR maps. Some of them are quite good and some are not as accurate. I can assure you that I take every effort in getting these maps as accurate as possible.