User Guide

The anchor Alarm in Savvy Navvy V2 has been updated significantly. 

When you have reach your destination you can set the anchor alarm by selecting the Anchor Alarm entry from the main menu. 

Your anchor position is shown on the screen as a blue icon as well as the indicator of your vessel position. To change the actual location of the anchor drag the anchor icon to where you dropped the anchor. The distance of the vessel to the anchor position is shown as a guide. 

When the anchor icon is dragged to the correct location for where your anchor is lying you can then set the geofence safety zone. There are two zones shown by the grey area. The outer safety zone is the maximum distance the vessel can be from the anchor position. Set this to be the length of the chain you have out plus a small margin so you don’t get a false alarm. If the vessel moves outside this area then the anchor is dragging as it should not be possible to move here if the anchor is fixed. To change the size of the outer safety zone drag the blue circular handle on the circle edge, a readout shows the distance to the anchor.

There is also a secondary inner safety zone that can be set, this is the swing zone. This is the maximum distance from the anchor that the vessel can travel in all directions. As the vessel is at anchor the winds and tides will move the vessel within this area over a period at anchor. By default the swing zone and the outer safety zone are the same radius. There may be an anchorage where there is a danger in a particular direction such as a submerged rock that you do not want to drag towards while you can have a bigger safety margin in the other directions. 

In this case you can set the swing zone separately. To do this there is a blue handle split by a grey line in the middle of the circle radius. If you drag the split handle you can split the circle and see three new blue handles. The inner circle handle sets the radius of the swing zone, the distance is shown to the anchor. This should be set to the maximum distance the vessel can possibly swing for the anchor chain that is out.

There will also be an exclusion area segment which is the difference between the swing zone and the outer safety zone. To make this segment larger, drag either of the blue handles on the sides of the segment. This will enlarge the segment equally. To rotate the segment to the position you want it to lie you can drag the handles on outer safety zone & inner swing zone circles, dragging in a circular motion. If you want to close the exclusion area segment, drag the segment handles on top of each other until the circle closes and there is a single split handle again.

When you are happy with the area you have defined, enable the alarm with the Set alarm button. If you don’t want to set the alarm, select cancel. Once the alarm is armed the circle will turn green as will the anchor position icon. There will be two buttons one will Disarm the alarm and the other Settings icon will allow you to change the geofence in situ. The vessel's position at anchor is also tracked by a blue trackline so you can see how it is moving in the current conditions relative to the anchor.

When the vessel leaves the safe area the alarm will sound. It is probably a good idea to now check the vessel’s position. There is a mute button to silence the alarm for 5 minutes while you do that. If it’s a false alarm you will need to modify the settings to make it less sensitive. If you are dragging then you will need to safely re-anchor and reset a new alarm at the new location.

When you want to leave the anchorage area disarm the alarm with the Disarm button and confirm that you want to Disarm alarm.

IMPORTANT for the alarm to function correctly:

• Device should be on charge (recommended) or full charged, GPS monitoring can drain the battery so on charge is best
• Device needs a good view of the sky to enable an accurate GPS position
• Device should not be on silent or low volume setting or do not disturb mode
• On iPhone/iPad it will honour the silent setting, so check it is not in silent mode before turning in
• The savvy navvy app needs to be running
• Device needs to remain on the vessel

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