Height clearances
If an obstructions charted minimum height is less than the configured Minimum safe height it is considered unsafe and will be marked with a caution symbol.
Auto-routeHeight clearancesThe configured Minimum safe height is compared with the obstructions charted minimum height, based on the datum used by the cartography.
The Height datum may be based on Mean High Water Springs (MHWS) or Highest Astronomical Tide (HAT).
Due to atmospheric effects such as high air pressure, wind direction, etc. the tide can be higher than MHWS and HAT. Therefore, it is important that users include a safety margin to their Minimum safe height and adjust the setting as necessary to allow for current conditions.
For information about configuring the Minimum safe height setting refer to: Minimum safe height