Harry Sealey requests as follows: he wants to set the display range not as constant distance but as a percentage of the sonar range. NOAA guidelines is good but it is set to fixed 12.5times of the altitude - he wants to be able to set a user value? Not sure if this is worth of adding as a new feature.
JIRA ticket SUP-1658
https://hypack.atlassian.net/jira/servicedesk/projects/SUP/queues/custom/32/SUP-1658