Most sailing in the Southern Ionian is line of sight. You will be able to see all the islands you plan to visit fairly easily. It is no more than 10 miles between each island with many harbours and bays within 1 mile of each other.
The prevailing breeze is North Westerly. Wind tends to be light in the mornings, around force 2-3, and builds during the afternoons to around force 4-5-6 (see Beaufort Scale later in the Guide). The later and earlier season (April and October) tend to see slightly more wind throughout the day and sometimes showers. The weather in the Ionian is very localized however and in season, most decisions on where you are going to sail each day are best made once you have looked at the wind direction outside the harbour!
There is virtually no tide in Greece and very few hazards (the exception being the Herimiti Shoal situated between Scorpios and Meganissi).