If you want new charts
for your route
it looks like 3 charts
which is going to be just short of £500, which isn't justified.
If Suffolk is your home then might be worth buying
this one, especially if it covers the Thames area with those sand banks.
I buy my charts from the Solent Marine
Superstore, who make them up on the spot to ensure they are completely up to date.
Electronic Charts - Electronics | Marine Super Store
For the delivery
trip, I would prefer up to date paper charts as I guess any on board will also be of a similar vintage. Would be much cheaper too.
I also doubt that the RC530 will accept AIS
, but do check with Raymarine. If so keep the RC530 as a spare stand alone chart plotter when you upgrade.
Final thought, have a read of this thread about Raymarine 125 GPS
ariels. You probably have the earlier 120 version so I can't say if it has a battery
inside it. However, if it has its now 8 years old and due a change.