Parker23":20xmtnwb said:
Thanks. Checked the manuel on the Navman site and it says you have to calibrate the reading sometimes, have you had to do it and is it easy?
Very easy ... less the impact to the wallet

that is! You fill up the tank, run around some and then go back to the dock. ((Here is where I'll try to to re-fill back up at the same time of day as the 1st day/time so hopefully the temperature is consistent))
Let's say your system says it used 12 gallons, but you only could put back in 11 gallons. You adjust the system to where you put back in 11 gallons and it automatically adjusts the tank to that new value as a constant. This value is invisible to you in actual use, and is only used by the device to "calibrate" itself ... that's why it is critical to me to fill up using the same fuel source, hose, technique, method, and/or time of day to achieve as reliable and consistent a cal process as possible.
To date I have done this only twice to my Navman unit (mine is integrated into my GPS) and on the 2nd time, it was only off by 0.3 gallons over 6 months of use and God knows how many gallons. Awesome products ... I'll never ever run a boat without radar, Bennett trim tabs, and a fuel computer integrated into the GPS.