hey everyone, i have a Lavorsi GPS speedo with a seperate tattle tale button. the speedo worked fine 3 weeks ago, but we went out this past weekend and it would just read 10mph the whole day. when i push the tattle tale button it reads 65mph, which would have been from 3 weeks ago, because we just cruised around this time and i know i didn't go over 50mph. i have no idea if it's the speedo, gps pick up, or if the tattle switch has anything to do with it. it was a different lake, could it be a bad gps signal area? any advice would be greatly appreciated. it kinda acts like the old style speedo when something clogged up the pick up tube and didn't let enough water go through...lol.