Ok that version leaves a lot to be desired. Here’s a better one where you can nudge the waypoints around visually with arrow buttons. I defaulted the nudge value to 0.5 meter since my mower is about 1 meter wide 
I’m working on a version where you can just nudge selected areas. Unfortunately FlightPlanner.cs has some protected variables making it difficult.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MissionPlanner.Utilities;
using MissionPlanner.Controls;
using System.IO;
using System.Windows.Forms;
using System.Diagnostics;
using MissionPlanner;
using System.Drawing;
// Mission Planner Nudge plugin. Work in progress.
// adds a Nudge right click option in the planner.
// Use at your own risk.
namespace Shortcuts
{
public class Plugin : MissionPlanner.Plugin.Plugin
{
System.Windows.Forms.TextBox edInput;
ToolStripMenuItem but;
MissionPlanner.Controls.MyDataGridView commands;
public override string Name
{
get { return "Waypoint Nudge Plugin"; }
}
public override string Version
{
get { return "0.10"; }
}
public override string Author
{
get { return "John Harlow"; }
}
public override bool Init()
{
return true;
}
public override bool Loaded()
{
but = new ToolStripMenuItem("Nudge");
but.Click += but_Click;
ToolStripItemCollection col = Host.FPMenuMap.Items;
col.Insert(0, but);
commands = Host.MainForm.FlightPlanner.Controls.Find("Commands", true).FirstOrDefault() as MissionPlanner.Controls.MyDataGridView;
return true;
}
public override bool Loop()
{
return true;
}
public override bool Exit()
{
return true;
}
void but_Click(object sender, EventArgs e)
{
Form form;
form = new Form();
form.AutoScaleMode = AutoScaleMode.Font;
SizeF dialogUnits;
dialogUnits = form.AutoScaleDimensions;
form.FormBorderStyle = FormBorderStyle.FixedDialog;
form.MinimizeBox = false;
form.MaximizeBox = false;
form.Text = "Waypoint Nudger";
form.ClientSize = new Size(180, 170);
form.StartPosition = FormStartPosition.CenterScreen;
System.Windows.Forms.Label lblPrompt;
lblPrompt = new System.Windows.Forms.Label();
lblPrompt.Parent = form;
lblPrompt.AutoSize = true;
lblPrompt.Left = 10;
lblPrompt.Top = 20;
lblPrompt.Text = "Nudge Dist (meters)";
edInput = new System.Windows.Forms.TextBox();
edInput.Parent = form;
edInput.Left = lblPrompt.Left + 110;
edInput.Top = lblPrompt.Top;
edInput.Width = 30;
edInput.Text = "0.5";
edInput.SelectAll();
Size buttonSize = new Size(50 * (int)dialogUnits.Width / 6, 14 * (int)dialogUnits.Height / 6);
System.Windows.Forms.Button bbOk = new();
bbOk.Parent = form;
bbOk.Text = "Close";
bbOk.DialogResult = DialogResult.OK;
form.AcceptButton = bbOk;
bbOk.Location = new Point(65, 130);
bbOk.Size = buttonSize;
Size moveButtonSize = new Size(20 * (int)dialogUnits.Width / 6, 14 * (int)dialogUnits.Height / 6);
System.Windows.Forms.Button bbLeft = new System.Windows.Forms.Button();
bbLeft.Parent = form;
bbLeft.Text = char.ConvertFromUtf32(0x2190);
bbLeft.Location = new Point(50, 60);
bbLeft.Size = moveButtonSize;
bbLeft.Click += moveClick;
bbLeft.Tag = "L";
System.Windows.Forms.Button bbRight = new System.Windows.Forms.Button();
bbRight.Parent = form;
bbRight.Text = char.ConvertFromUtf32(0x2192);
bbRight.Location = new Point(110, 60);
bbRight.Size = moveButtonSize;
bbRight.Click += moveClick;
bbRight.Tag = "R";
System.Windows.Forms.Button bbUp = new System.Windows.Forms.Button();
bbUp.Parent = form;
bbUp.Text = char.ConvertFromUtf32(0x2191);
bbUp.Location = new Point(80, 40);
bbUp.Size = moveButtonSize;
bbUp.Click += moveClick;
bbUp.Tag = "U";
System.Windows.Forms.Button bbDown = new System.Windows.Forms.Button();
bbDown.Parent = form;
bbDown.Text = char.ConvertFromUtf32(0x2193);
bbDown.Location = new Point(80, 80);
bbDown.Size = moveButtonSize;
bbDown.Click += moveClick;
bbDown.Tag = "D";
form.ShowDialog();
}
void moveClick(object sender, EventArgs e)
{
double lat_trans = 0;
double lon_trans = 0;
double transVal = Double.Parse(edInput.Text);
switch (((System.Windows.Forms.Button)sender).Tag)
{
case "L":
lon_trans = -transVal;
break;
case "R":
lon_trans = transVal;
break;
case "D":
lat_trans = -transVal;
break;
case "U":
lat_trans = transVal;
break;
}
double earth_radius = 6378.137;
double m_lat = (1 / ((2 * Math.PI / 360) * earth_radius)) / 1000;
double m_long = (1 / ((2 * Math.PI / 360) * earth_radius)) / 1000; // # 1 meter in degree
// iterate through the waypoints
foreach (DataGridViewRow row in commands.Rows)
{
if (row.Cells[0].Value.ToString() == MAVLink.MAV_CMD.WAYPOINT.ToString())
{
double lat = Double.Parse(row.Cells[5].Value.ToString());
double lon = Double.Parse(row.Cells[6].Value.ToString());
// Calculate top, which is lat_translation_meters above
double lat_new = lat + (lat_trans * m_lat);
// Calculate right, which is long_translation_meters right
double lon_new = lon + (lon_trans * m_long) / Math.Cos(lat * (Math.PI / 180));
row.Cells[5].Value = lat_new.ToString();
row.Cells[6].Value = lon_new.ToString();
}
}
// redraw the map
Host.MainForm.FlightPlanner.writeKML();
}
}
}
)