I have a 62S Garmin with a topo map sd card from huntingpsmaps.com in it. The problem is after turning unit on, it starts to auto track...ok.....but the blue tracking arrow never follows the direction I ma going and eventually goes off screen. Then I have to page back to maps and sometimes it will refresh with arrow back in field of view. Also when mounted on motorcycle and moving, the arrow points down not up as I travel. I have a old 60csx I got a yard sale and it does not do this.....tracks in direction I move..etc. On 62S it is in track north up and I did calibrate compass. What is going on with this unit. Been like this since I bought it and thought that was normal. Apparently not. Help, thanks.