How can I control a PC from an Android tablet please?

I have an oldish Dell laptop running XP on my boat. It is used as the navigation computer and displays charts giving current position on the chart plus useful information. Some requires me to click on a target on the chart to get additional information, an example is a potential collision with a ship given by what is called AIS data. To save going below every time I hear the alarm I would like to see the PC screnn and click on it using a Tablet, probably an Android Samsung Galaxy Tab 10.1. I have looked hard for suitable software but most seems to assume both machines are on Internet. I would like to use a Bluetooth connection but could fit a wireless router to give a LAN with WiFi. Any suggestions as to what I could use please?