No real measurements that Im aware of. Just hold it up and find a placement that you like. You can hold it in place with a couple of pieces of tape, step back and take a look. If you know where the waterline is on the bow, you can place the decal where it will be above the waterline and visible to all.Jim EbarbMany, LA (Toledo Bend Lake)2004 Cougar/ 225 OptimaxHumminbird Helix 12 Chirp SI on BalzOut Mount at bowLowrance HDS 7 at bowHumminbird Helix 12 Mega SI on Ram Mount at ConsoleLowrance HDS 8 in dash at console