Hello, I searched the thread but could not find a definitive answer to my problem. Hence I would need some advice regarding mapping with Autochart Live and changing water levels in particular. I use to fish on a reservoir (hydro dam) used for flood control where water levels change a lot over the year. Typically, the reservoir level is highest in early spring and than continually goes down during the fishing period.
There are no commercial maps available for this lake. Thus I have to rely on Autochart Live mapping but have to deal with the changing water levels. The surface is roughly 2,000 acres, so no chance to get mapping done without changes of water level in the meantime.
My initial approach was to define a reference level (full pool) and set the delta between current water level and this reference level as water level offset in my Helix 9 G3N every time before recording starts. I hoped that the control head would take this offset into account when recording the data so that the whole autochart live map could later be easily shifted towards a different water level offset without any frictions. However, this doesn't seem to work as expected. To me it seems as if the defined water level offset is only taken into account for generating the autochart live map from recorded data, but not to adjust freshly recorded data itself to the reference level. Some days ago, for example, I made a custom map for a new portion of my lake. Water level offset was set to -8 ft which corresponds with the current level compared to my self-defined reference point. Actual depth displayed on the sonar was 15ft, but the generated Autochart Live Map only showed 7ft. I found that the map is only displayed correctly if I set the water level offset to 0. Leaving the water level offset at -8 ft - as it was during the recording - results in a map where all displayed depths are 8 feet less than the the actual depth. To me that seems to imply that all recorded data assumes a water level offset of 0.
Can you confirm that this is the normal and intended behaviour with Autochart Live? That would mean that water level offset could be used to adjust data which was recorded at one unchanged water level to a later change, but merging of recordings which were recorded at different water levels was more or less impossible. (at least without using Autochart Pro desktop software) I cannot really believe this is intended because taking into account the setpoint for the water level offset while recording new Autochart Live data would be very easy from an algorithmic perspective.
Best regards,
Christoph